diff --git a/poetry.lock b/poetry.lock
index f365b582..ebe8dd23 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,27 +1,26 @@
 [[package]]
-category = "dev"
-description = "A configurable sidebar-enabled Sphinx theme"
 name = "alabaster"
+version = "0.7.12"
+description = "A configurable sidebar-enabled Sphinx theme"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.7.12"
 
 [[package]]
-category = "dev"
-description = "Atomic file writes."
-marker = "sys_platform == \"win32\""
 name = "atomicwrites"
+version = "1.3.0"
+description = "Atomic file writes."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.3.0"
 
 [[package]]
-category = "dev"
-description = "Classes Without Boilerplate"
 name = "attrs"
+version = "19.3.0"
+description = "Classes Without Boilerplate"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "19.3.0"
 
 [package.extras]
 azure-pipelines = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "pytest-azurepipelines"]
@@ -30,87 +29,85 @@ docs = ["sphinx", "zope.interface"]
 tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 
 [[package]]
-category = "dev"
-description = "Internationalization utilities"
 name = "babel"
+version = "2.8.0"
+description = "Internationalization utilities"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.8.0"
 
 [package.dependencies]
 pytz = ">=2015.7"
 
 [[package]]
-category = "main"
-description = "Base58 and Base58Check implementation"
 name = "base58"
+version = "2.0.0"
+description = "Base58 and Base58Check implementation"
+category = "main"
 optional = false
 python-versions = ">=3.5"
-version = "2.0.0"
 
 [[package]]
-category = "main"
-description = "Python package for providing Mozilla's CA Bundle."
 name = "certifi"
+version = "2019.11.28"
+description = "Python package for providing Mozilla's CA Bundle."
+category = "main"
 optional = false
 python-versions = "*"
-version = "2019.11.28"
 
 [[package]]
-category = "main"
-description = "Foreign Function Interface for Python calling C code."
 name = "cffi"
+version = "1.13.2"
+description = "Foreign Function Interface for Python calling C code."
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.13.2"
 
 [package.dependencies]
 pycparser = "*"
 
 [[package]]
-category = "main"
-description = "Universal encoding detector for Python 2 and 3"
 name = "chardet"
+version = "3.0.4"
+description = "Universal encoding detector for Python 2 and 3"
+category = "main"
 optional = false
 python-versions = "*"
-version = "3.0.4"
 
 [[package]]
-category = "main"
-description = "Composable command line interface toolkit"
 name = "click"
+version = "7.0"
+description = "Composable command line interface toolkit"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "7.0"
 
 [[package]]
-category = "dev"
-description = "Cross-platform colored terminal text."
-marker = "sys_platform == \"win32\""
 name = "colorama"
+version = "0.4.3"
+description = "Cross-platform colored terminal text."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "0.4.3"
 
 [[package]]
-category = "dev"
-description = "Code coverage measurement for Python"
 name = "coverage"
+version = "5.0.3"
+description = "Code coverage measurement for Python"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
-version = "5.0.3"
 
 [package.extras]
 toml = ["toml"]
 
 [[package]]
-category = "main"
-description = "Cython implementation of Toolz: High performance functional utilities"
-marker = "implementation_name == \"cpython\""
 name = "cytoolz"
+version = "0.10.1"
+description = "Cython implementation of Toolz: High performance functional utilities"
+category = "main"
 optional = false
 python-versions = "*"
-version = "0.10.1"
 
 [package.dependencies]
 toolz = ">=0.8.0"
@@ -119,20 +116,20 @@ toolz = ">=0.8.0"
 cython = ["cython"]
 
 [[package]]
-category = "main"
-description = "Decorators for Humans"
 name = "decorator"
+version = "4.4.1"
+description = "Decorators for Humans"
+category = "main"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*"
-version = "4.4.1"
 
 [[package]]
-category = "main"
-description = "Python @deprecated decorator to deprecate old python classes, functions or methods."
 name = "deprecated"
+version = "1.2.7"
+description = "Python @deprecated decorator to deprecate old python classes, functions or methods."
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.2.7"
 
 [package.dependencies]
 wrapt = ">=1.10,<2"
@@ -141,79 +138,79 @@ wrapt = ">=1.10,<2"
 dev = ["tox", "bumpversion (<1)", "sphinx (<2)", "PyTest (<5)", "PyTest-Cov (<2.6)", "pytest", "pytest-cov"]
 
 [[package]]
-category = "dev"
-description = "Docutils -- Python Documentation Utilities"
 name = "docutils"
+version = "0.16"
+description = "Docutils -- Python Documentation Utilities"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "0.16"
 
 [[package]]
-category = "dev"
-description = "Discover and load entry points from installed packages."
 name = "entrypoints"
+version = "0.3"
+description = "Discover and load entry points from installed packages."
+category = "dev"
 optional = false
 python-versions = ">=2.7"
-version = "0.3"
 
 [[package]]
-category = "main"
-description = "eth-hash: The Ethereum hashing function, keccak256, sometimes (erroneously) called sha3"
 name = "eth-hash"
+version = "0.2.0"
+description = "eth-hash: The Ethereum hashing function, keccak256, sometimes (erroneously) called sha3"
+category = "main"
 optional = false
 python-versions = ">=3.5, <4"
-version = "0.2.0"
 
 [package.extras]
-dev = ["bumpversion (>=0.5.3,<1)", "pytest-xdist", "pytest-watch (>=4.1.0,<5)", "wheel", "ipython", "pytest (3.3.2)", "tox (>=2.9.1,<3)", "flake8 (3.4.1)", "isort (>=4.2.15,<5)", "Sphinx (>=1.6.5,<2)", "sphinx-rtd-theme (>=0.1.9)"]
+dev = ["bumpversion (>=0.5.3,<1)", "pytest-xdist", "pytest-watch (>=4.1.0,<5)", "wheel", "ipython", "pytest (==3.3.2)", "tox (>=2.9.1,<3)", "flake8 (==3.4.1)", "isort (>=4.2.15,<5)", "Sphinx (>=1.6.5,<2)", "sphinx-rtd-theme (>=0.1.9)"]
 doc = ["Sphinx (>=1.6.5,<2)", "sphinx-rtd-theme (>=0.1.9)"]
-lint = ["flake8 (3.4.1)", "isort (>=4.2.15,<5)"]
+lint = ["flake8 (==3.4.1)", "isort (>=4.2.15,<5)"]
 pycryptodome = ["pycryptodome (>=3.6.6,<4)"]
 pysha3 = ["pysha3 (>=1.0.0,<2.0.0)"]
-test = ["pytest (3.3.2)", "tox (>=2.9.1,<3)"]
+test = ["pytest (==3.3.2)", "tox (>=2.9.1,<3)"]
 
 [[package]]
-category = "main"
-description = "eth-typing: Common type annotations for ethereum python packages"
 name = "eth-typing"
+version = "2.2.1"
+description = "eth-typing: Common type annotations for ethereum python packages"
+category = "main"
 optional = false
 python-versions = ">=3.5, <4"
-version = "2.2.1"
 
 [package.extras]
-dev = ["bumpversion (>=0.5.3,<1)", "pytest-watch (>=4.1.0,<5)", "wheel", "twine", "ipython", "pytest (>=4.4,<4.5)", "pytest-xdist", "tox (>=2.9.1,<3)", "flake8 (3.4.1)", "isort (>=4.2.15,<5)", "mypy (0.701)", "pydocstyle (>=3.0.0,<4)", "Sphinx (>=1.6.5,<2)", "sphinx-rtd-theme (>=0.1.9)"]
+dev = ["bumpversion (>=0.5.3,<1)", "pytest-watch (>=4.1.0,<5)", "wheel", "twine", "ipython", "pytest (>=4.4,<4.5)", "pytest-xdist", "tox (>=2.9.1,<3)", "flake8 (==3.4.1)", "isort (>=4.2.15,<5)", "mypy (==0.701)", "pydocstyle (>=3.0.0,<4)", "Sphinx (>=1.6.5,<2)", "sphinx-rtd-theme (>=0.1.9)"]
 doc = ["Sphinx (>=1.6.5,<2)", "sphinx-rtd-theme (>=0.1.9)"]
-lint = ["flake8 (3.4.1)", "isort (>=4.2.15,<5)", "mypy (0.701)", "pydocstyle (>=3.0.0,<4)"]
+lint = ["flake8 (==3.4.1)", "isort (>=4.2.15,<5)", "mypy (==0.701)", "pydocstyle (>=3.0.0,<4)"]
 test = ["pytest (>=4.4,<4.5)", "pytest-xdist", "tox (>=2.9.1,<3)"]
 
 [[package]]
-category = "main"
-description = "Common utility functions for ethereum codebases."
 name = "eth-utils"
+version = "1.8.4"
+description = "Common utility functions for ethereum codebases."
+category = "main"
 optional = false
 python-versions = ">=3.5,!=3.5.2,<4"
-version = "1.8.4"
 
 [package.dependencies]
-cytoolz = ">=0.10.1,<1.0.0"
+cytoolz = {version = ">=0.10.1,<1.0.0", markers = "implementation_name == \"cpython\""}
 eth-hash = ">=0.1.0,<1.0.0"
 eth-typing = ">=2.2.1,<3.0.0"
-toolz = ">0.8.2,<1"
+toolz = {version = ">0.8.2,<1", markers = "implementation_name == \"pypy\""}
 
 [package.extras]
 deploy = ["bumpversion (>=0.5.3,<1.0.0)", "tox (>=2.9.1,<3.0.0)", "wheel (>=0.30.0,<1.0.0)"]
-dev = ["twine (>=1.13,<2)", "Sphinx (>=1.5.5,<2)", "sphinx-rtd-theme (>=0.1.9,<2)", "towncrier (>=19.2.0,<20)", "black (>=18.6b4,<19)", "flake8 (>=3.7.0,<4.0.0)", "isort (4.3.18)", "mypy (0.701)", "pytest (>=3.4.1,<4.0.0)", "hypothesis (>=4.43.0,<5.0.0)", "pytest-pythonpath (>=0.3,<1.0)", "bumpversion (>=0.5.3,<1.0.0)", "tox (>=2.9.1,<3.0.0)", "wheel (>=0.30.0,<1.0.0)"]
+dev = ["twine (>=1.13,<2)", "Sphinx (>=1.5.5,<2)", "sphinx-rtd-theme (>=0.1.9,<2)", "towncrier (>=19.2.0,<20)", "black (>=18.6b4,<19)", "flake8 (>=3.7.0,<4.0.0)", "isort (==4.3.18)", "mypy (==0.701)", "pytest (>=3.4.1,<4.0.0)", "hypothesis (>=4.43.0,<5.0.0)", "pytest-pythonpath (>=0.3,<1.0)", "bumpversion (>=0.5.3,<1.0.0)", "tox (>=2.9.1,<3.0.0)", "wheel (>=0.30.0,<1.0.0)"]
 doc = ["Sphinx (>=1.5.5,<2)", "sphinx-rtd-theme (>=0.1.9,<2)", "towncrier (>=19.2.0,<20)"]
-lint = ["black (>=18.6b4,<19)", "flake8 (>=3.7.0,<4.0.0)", "isort (4.3.18)", "mypy (0.701)", "pytest (>=3.4.1,<4.0.0)"]
+lint = ["black (>=18.6b4,<19)", "flake8 (>=3.7.0,<4.0.0)", "isort (==4.3.18)", "mypy (==0.701)", "pytest (>=3.4.1,<4.0.0)"]
 test = ["hypothesis (>=4.43.0,<5.0.0)", "pytest (>=3.4.1,<4.0.0)", "pytest-pythonpath (>=0.3,<1.0)"]
 
 [[package]]
-category = "dev"
-description = "the modular source code checker: pep8, pyflakes and co"
 name = "flake8"
+version = "3.7.9"
+description = "the modular source code checker: pep8, pyflakes and co"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "3.7.9"
 
 [package.dependencies]
 entrypoints = ">=0.3.0,<0.4.0"
@@ -222,40 +219,39 @@ pycodestyle = ">=2.5.0,<2.6.0"
 pyflakes = ">=2.1.0,<2.2.0"
 
 [[package]]
-category = "dev"
-description = "Automatic Changelog generator using Jinja2 templates."
 name = "git-changelog"
+version = "0.2.0"
+description = "Automatic Changelog generator using Jinja2 templates."
+category = "dev"
 optional = false
 python-versions = ">=3.6,<4.0"
-version = "0.2.0"
 
 [package.dependencies]
 Jinja2 = ">=2.10,<3.0"
 
 [[package]]
-category = "main"
-description = "Internationalized Domain Names in Applications (IDNA)"
 name = "idna"
+version = "2.8"
+description = "Internationalized Domain Names in Applications (IDNA)"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.8"
 
 [[package]]
-category = "dev"
-description = "Getting image size from png/jpeg/jpeg2000/gif file"
 name = "imagesize"
+version = "1.2.0"
+description = "Getting image size from png/jpeg/jpeg2000/gif file"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.2.0"
 
 [[package]]
-category = "dev"
-description = "Read metadata from Python packages"
-marker = "python_version < \"3.8\""
 name = "importlib-metadata"
+version = "1.5.0"
+description = "Read metadata from Python packages"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.5.0"
 
 [package.dependencies]
 zipp = ">=0.5"
@@ -265,12 +261,20 @@ docs = ["sphinx", "rst.linker"]
 testing = ["packaging", "importlib-resources"]
 
 [[package]]
+name = "iniconfig"
+version = "1.1.1"
+description = "iniconfig: brain-dead simple config-ini parsing"
 category = "dev"
-description = "A very fast and expressive template engine."
+optional = false
+python-versions = "*"
+
+[[package]]
 name = "jinja2"
+version = "2.11.1"
+description = "A very fast and expressive template engine."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.11.1"
 
 [package.dependencies]
 MarkupSafe = ">=0.23"
@@ -279,44 +283,36 @@ MarkupSafe = ">=0.23"
 i18n = ["Babel (>=0.8)"]
 
 [[package]]
-category = "dev"
-description = "Safely add untrusted strings to HTML/XML markup."
 name = "markupsafe"
+version = "1.1.1"
+description = "Safely add untrusted strings to HTML/XML markup."
+category = "dev"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
-version = "1.1.1"
 
 [[package]]
-category = "dev"
-description = "McCabe checker, plugin for flake8"
 name = "mccabe"
+version = "0.6.1"
+description = "McCabe checker, plugin for flake8"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.6.1"
 
 [[package]]
-category = "main"
-description = "Implementation of Bitcoin BIP-0039"
 name = "mnemonic"
-optional = false
-python-versions = "*"
 version = "0.19"
-
-[[package]]
-category = "dev"
-description = "More routines for operating on iterables, beyond itertools"
-name = "more-itertools"
+description = "Implementation of Bitcoin BIP-0039"
+category = "main"
 optional = false
-python-versions = ">=3.5"
-version = "8.2.0"
+python-versions = "*"
 
 [[package]]
-category = "main"
-description = "A dot-accessible dictionary (a la JavaScript objects)"
 name = "munch"
+version = "2.5.0"
+description = "A dot-accessible dictionary (a la JavaScript objects)"
+category = "main"
 optional = false
 python-versions = "*"
-version = "2.5.0"
 
 [package.dependencies]
 six = "*"
@@ -326,80 +322,78 @@ testing = ["pytest", "coverage", "astroid (>=1.5.3,<1.6.0)", "pylint (>=1.7.2,<1
 yaml = ["PyYAML (>=5.1.0)"]
 
 [[package]]
-category = "dev"
-description = "Core utilities for Python packages"
 name = "packaging"
+version = "20.1"
+description = "Core utilities for Python packages"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "20.1"
 
 [package.dependencies]
 pyparsing = ">=2.0.2"
 six = "*"
 
 [[package]]
-category = "dev"
-description = "plugin and hook calling mechanisms for python"
 name = "pluggy"
+version = "0.13.1"
+description = "plugin and hook calling mechanisms for python"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.13.1"
 
 [package.dependencies]
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 
 [package.extras]
 dev = ["pre-commit", "tox"]
 
 [[package]]
-category = "dev"
-description = "library with cross-python path, ini-parsing, io, code, log facilities"
 name = "py"
+version = "1.10.0"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.8.1"
 
 [[package]]
-category = "dev"
-description = "Python style guide checker"
 name = "pycodestyle"
+version = "2.5.0"
+description = "Python style guide checker"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.5.0"
 
 [[package]]
-category = "main"
-description = "C parser in Python"
 name = "pycparser"
+version = "2.19"
+description = "C parser in Python"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.19"
 
 [[package]]
-category = "dev"
-description = "passive checker of Python programs"
 name = "pyflakes"
+version = "2.1.1"
+description = "passive checker of Python programs"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.1.1"
 
 [[package]]
-category = "dev"
-description = "Pygments is a syntax highlighting package written in Python."
 name = "pygments"
+version = "2.5.2"
+description = "Pygments is a syntax highlighting package written in Python."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.5.2"
 
 [[package]]
-category = "main"
-description = "Python binding to the Networking and Cryptography (NaCl) library"
 name = "pynacl"
+version = "1.3.0"
+description = "Python binding to the Networking and Cryptography (NaCl) library"
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.3.0"
 
 [package.dependencies]
 cffi = ">=1.4.1"
@@ -407,72 +401,68 @@ six = "*"
 
 [package.extras]
 docs = ["sphinx (>=1.6.5)", "sphinx-rtd-theme"]
-tests = ["pytest (>=3.2.1,<3.3.0 || >3.3.0)", "hypothesis (>=3.27.0)"]
+tests = ["pytest (>=3.2.1,!=3.3.0)", "hypothesis (>=3.27.0)"]
 
 [[package]]
-category = "dev"
-description = "Python parsing module"
 name = "pyparsing"
+version = "2.4.6"
+description = "Python parsing module"
+category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "2.4.6"
 
 [[package]]
-category = "dev"
-description = "pytest: simple powerful testing with Python"
 name = "pytest"
+version = "6.2.4"
+description = "pytest: simple powerful testing with Python"
+category = "dev"
 optional = false
-python-versions = ">=3.5"
-version = "5.3.5"
+python-versions = ">=3.6"
 
 [package.dependencies]
-atomicwrites = ">=1.0"
-attrs = ">=17.4.0"
-colorama = "*"
-more-itertools = ">=4.0.0"
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
+attrs = ">=19.2.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+iniconfig = "*"
 packaging = "*"
-pluggy = ">=0.12,<1.0"
-py = ">=1.5.0"
-wcwidth = "*"
-
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
+pluggy = ">=0.12,<1.0.0a1"
+py = ">=1.8.2"
+toml = "*"
 
 [package.extras]
-checkqa-mypy = ["mypy (v0.761)"]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
 [[package]]
-category = "dev"
-description = "Pytest plugin for measuring coverage."
 name = "pytest-cov"
+version = "2.8.1"
+description = "Pytest plugin for measuring coverage."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.8.1"
 
 [package.dependencies]
 coverage = ">=4.4"
 pytest = ">=3.6"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "virtualenv"]
+testing = ["fields", "hunter", "process-tests (==2.0.2)", "six", "virtualenv"]
 
 [[package]]
-category = "dev"
-description = "World timezone definitions, modern and historical"
 name = "pytz"
+version = "2019.3"
+description = "World timezone definitions, modern and historical"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "2019.3"
 
 [[package]]
-category = "main"
-description = "Python HTTP for Humans."
 name = "requests"
+version = "2.22.0"
+description = "Python HTTP for Humans."
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.22.0"
 
 [package.dependencies]
 certifi = ">=2017.4.17"
@@ -482,76 +472,75 @@ urllib3 = ">=1.21.1,<1.25.0 || >1.25.0,<1.25.1 || >1.25.1,<1.26"
 
 [package.extras]
 security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)"]
-socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7)", "win-inet-pton"]
+socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
 
 [[package]]
-category = "main"
-description = "A package for Recursive Length Prefix encoding and decoding"
 name = "rlp"
+version = "1.2.0"
+description = "A package for Recursive Length Prefix encoding and decoding"
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.2.0"
 
 [package.dependencies]
 eth-utils = ">=1.0.2,<2"
 
 [package.extras]
-dev = ["bumpversion (>=0.5.3,<1)", "setuptools (>=36.2.0)", "pytest-xdist", "pytest-watch (>=4.1.0,<5)", "wheel", "ipython", "twine", "pytest (3.3.2)", "tox (>=2.9.1,<3)", "hypothesis (3.56.5)", "flake8 (3.4.1)", "Sphinx (>=1.6.5,<2)", "sphinx-rtd-theme (>=0.1.9)"]
+dev = ["bumpversion (>=0.5.3,<1)", "setuptools (>=36.2.0)", "pytest-xdist", "pytest-watch (>=4.1.0,<5)", "wheel", "ipython", "twine", "pytest (==3.3.2)", "tox (>=2.9.1,<3)", "hypothesis (==3.56.5)", "flake8 (==3.4.1)", "Sphinx (>=1.6.5,<2)", "sphinx-rtd-theme (>=0.1.9)"]
 doc = ["Sphinx (>=1.6.5,<2)", "sphinx-rtd-theme (>=0.1.9)"]
-lint = ["flake8 (3.4.1)"]
-test = ["pytest (3.3.2)", "tox (>=2.9.1,<3)", "hypothesis (3.56.5)"]
+lint = ["flake8 (==3.4.1)"]
+test = ["pytest (==3.3.2)", "tox (>=2.9.1,<3)", "hypothesis (==3.56.5)"]
 
 [[package]]
-category = "main"
-description = "Python helper for Semantic Versioning (http://semver.org/)"
 name = "semver"
+version = "2.9.0"
+description = "Python helper for Semantic Versioning (http://semver.org/)"
+category = "main"
 optional = false
 python-versions = "*"
-version = "2.9.0"
 
 [[package]]
-category = "main"
-description = "Simple, fast, extensible JSON encoder/decoder for Python"
 name = "simplejson"
+version = "3.17.0"
+description = "Simple, fast, extensible JSON encoder/decoder for Python"
+category = "main"
 optional = false
 python-versions = ">=2.5, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "3.17.0"
 
 [[package]]
-category = "main"
-description = "Python 2 and 3 compatibility utilities"
 name = "six"
+version = "1.14.0"
+description = "Python 2 and 3 compatibility utilities"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "1.14.0"
 
 [[package]]
-category = "dev"
-description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
 name = "snowballstemmer"
+version = "2.0.0"
+description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "2.0.0"
 
 [[package]]
-category = "dev"
-description = "Python documentation generator"
 name = "sphinx"
+version = "2.3.1"
+description = "Python documentation generator"
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "2.3.1"
 
 [package.dependencies]
-Jinja2 = ">=2.3"
-Pygments = ">=2.0"
 alabaster = ">=0.7,<0.8"
 babel = ">=1.3,<2.0 || >2.0"
-colorama = ">=0.3.5"
+colorama = {version = ">=0.3.5", markers = "sys_platform == \"win32\""}
 docutils = ">=0.12"
 imagesize = "*"
+Jinja2 = ">=2.3"
 packaging = "*"
+Pygments = ">=2.0"
 requests = ">=2.5.0"
-setuptools = "*"
 snowballstemmer = ">=1.1"
 sphinxcontrib-applehelp = "*"
 sphinxcontrib-devhelp = "*"
@@ -565,111 +554,118 @@ docs = ["sphinxcontrib-websupport"]
 test = ["pytest", "pytest-cov", "html5lib", "flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.761)", "docutils-stubs"]
 
 [[package]]
-category = "dev"
-description = "Read the Docs theme for Sphinx"
 name = "sphinx-rtd-theme"
+version = "0.4.3"
+description = "Read the Docs theme for Sphinx"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.4.3"
 
 [package.dependencies]
 sphinx = "*"
 
 [[package]]
-category = "dev"
-description = ""
 name = "sphinxcontrib-applehelp"
+version = "1.0.1"
+description = ""
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.0.1"
 
 [package.extras]
 test = ["pytest", "flake8", "mypy"]
 
 [[package]]
-category = "dev"
-description = ""
 name = "sphinxcontrib-devhelp"
+version = "1.0.1"
+description = ""
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.0.1"
 
 [package.extras]
 test = ["pytest", "flake8", "mypy"]
 
 [[package]]
-category = "dev"
-description = ""
 name = "sphinxcontrib-htmlhelp"
+version = "1.0.2"
+description = ""
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.0.2"
 
 [package.extras]
 test = ["pytest", "flake8", "mypy", "html5lib"]
 
 [[package]]
-category = "dev"
-description = "A sphinx extension which renders display math in HTML via JavaScript"
 name = "sphinxcontrib-jsmath"
+version = "1.0.1"
+description = "A sphinx extension which renders display math in HTML via JavaScript"
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "1.0.1"
 
 [package.extras]
 test = ["pytest", "flake8", "mypy"]
 
 [[package]]
-category = "dev"
-description = ""
 name = "sphinxcontrib-qthelp"
+version = "1.0.2"
+description = ""
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.0.2"
 
 [package.extras]
 test = ["pytest", "flake8", "mypy"]
 
 [[package]]
-category = "dev"
-description = ""
 name = "sphinxcontrib-serializinghtml"
+version = "1.1.3"
+description = ""
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.1.3"
 
 [package.extras]
 test = ["pytest", "flake8", "mypy"]
 
 [[package]]
-category = "main"
-description = "List processing tools and functional utilities"
-marker = "implementation_name == \"cpython\" or implementation_name == \"pypy\""
+name = "toml"
+version = "0.10.2"
+description = "Python Library for Tom's Obvious, Minimal Language"
+category = "dev"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+
+[[package]]
 name = "toolz"
+version = "0.10.0"
+description = "List processing tools and functional utilities"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.10.0"
 
 [[package]]
-category = "main"
-description = "HTTP library with thread-safe connection pooling, file post, and more."
 name = "urllib3"
+version = "1.25.8"
+description = "HTTP library with thread-safe connection pooling, file post, and more."
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
-version = "1.25.8"
 
 [package.extras]
 brotli = ["brotlipy (>=0.6.0)"]
 secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
-socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7,<2.0)"]
+socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [[package]]
-category = "main"
-description = "Python Data Validation for Humans™."
 name = "validators"
+version = "0.14.2"
+description = "Python Data Validation for Humans™."
+category = "main"
 optional = false
 python-versions = "*"
-version = "0.14.2"
 
 [package.dependencies]
 decorator = ">=3.4.0"
@@ -679,37 +675,28 @@ six = ">=1.4.0"
 test = ["pytest (>=2.2.3)", "flake8 (>=2.4.0)", "isort (>=4.2.2)"]
 
 [[package]]
-category = "dev"
-description = "Measures number of Terminal column cells of wide-character codes"
-name = "wcwidth"
-optional = false
-python-versions = "*"
-version = "0.1.8"
-
-[[package]]
-category = "main"
-description = "An implementation of the WebSocket Protocol (RFC 6455 & 7692)"
 name = "websockets"
+version = "8.1"
+description = "An implementation of the WebSocket Protocol (RFC 6455 & 7692)"
+category = "main"
 optional = false
 python-versions = ">=3.6.1"
-version = "8.1"
 
 [[package]]
-category = "main"
-description = "Module for decorators, wrappers and monkey patching."
 name = "wrapt"
+version = "1.11.2"
+description = "Module for decorators, wrappers and monkey patching."
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.11.2"
 
 [[package]]
-category = "dev"
-description = "Backport of pathlib-compatible object wrapper for zip files"
-marker = "python_version < \"3.8\""
 name = "zipp"
+version = "2.1.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
-version = "2.1.0"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
@@ -719,8 +706,9 @@ testing = ["jaraco.itertools"]
 test = []
 
 [metadata]
-content-hash = "9c146bf1228cd0a6692ad64c1fc2e54570e4e020961f31015d90fb0fd665341b"
+lock-version = "1.1"
 python-versions = "^3.7"
+content-hash = "9414b81dd9859c87bbacad2db7b7b3f061cfacdeaf9ab6d1d8a65652bc69b55b"
 
 [metadata.files]
 alabaster = [
@@ -878,6 +866,10 @@ importlib-metadata = [
     {file = "importlib_metadata-1.5.0-py2.py3-none-any.whl", hash = "sha256:b97607a1a18a5100839aec1dc26a1ea17ee0d93b20b0f008d80a5a050afb200b"},
     {file = "importlib_metadata-1.5.0.tar.gz", hash = "sha256:06f5b3a99029c7134207dd882428a66992a9de2bef7c2b699b5641f9886c3302"},
 ]
+iniconfig = [
+    {file = "iniconfig-1.1.1-py2.py3-none-any.whl", hash = "sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3"},
+    {file = "iniconfig-1.1.1.tar.gz", hash = "sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32"},
+]
 jinja2 = [
     {file = "Jinja2-2.11.1-py2.py3-none-any.whl", hash = "sha256:b0eaf100007721b5c16c1fc1eecb87409464edc10469ddc9a22a27a99123be49"},
     {file = "Jinja2-2.11.1.tar.gz", hash = "sha256:93187ffbc7808079673ef52771baa950426fd664d3aad1d0fa3e95644360e250"},
@@ -901,20 +893,39 @@ markupsafe = [
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     {file = "MarkupSafe-1.1.1-cp35-cp35m-win_amd64.whl", hash = "sha256:9add70b36c5666a2ed02b43b335fe19002ee5235efd4b8a89bfcf9005bebac0d"},
     {file = "MarkupSafe-1.1.1-cp36-cp36m-macosx_10_6_intel.whl", hash = "sha256:24982cc2533820871eba85ba648cd53d8623687ff11cbb805be4ff7b4c971aff"},
+    {file = "MarkupSafe-1.1.1-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:d53bc011414228441014aa71dbec320c66468c1030aae3a6e29778a3382d96e5"},
     {file = "MarkupSafe-1.1.1-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:00bc623926325b26bb9605ae9eae8a215691f33cae5df11ca5424f06f2d1f473"},
     {file = "MarkupSafe-1.1.1-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:717ba8fe3ae9cc0006d7c451f0bb265ee07739daf76355d06366154ee68d221e"},
+    {file = "MarkupSafe-1.1.1-cp36-cp36m-manylinux2010_i686.whl", hash = "sha256:3b8a6499709d29c2e2399569d96719a1b21dcd94410a586a18526b143ec8470f"},
+    {file = "MarkupSafe-1.1.1-cp36-cp36m-manylinux2010_x86_64.whl", hash = "sha256:84dee80c15f1b560d55bcfe6d47b27d070b4681c699c572af2e3c7cc90a3b8e0"},
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 ]
 mccabe = [
@@ -925,10 +936,6 @@ mnemonic = [
     {file = "mnemonic-0.19-py2.py3-none-any.whl", hash = "sha256:a8d78c5100acfa7df9bab6b9db7390831b0e54490934b718ff9efd68f0d731a6"},
     {file = "mnemonic-0.19.tar.gz", hash = "sha256:4e37eb02b2cbd56a0079cabe58a6da93e60e3e4d6e757a586d9f23d96abea931"},
 ]
-more-itertools = [
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-]
 munch = [
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@@ -942,8 +949,8 @@ pluggy = [
     {file = "pluggy-0.13.1.tar.gz", hash = "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0"},
 ]
 py = [
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-    {file = "py-1.8.1.tar.gz", hash = "sha256:5e27081401262157467ad6e7f851b7aa402c5852dbcb3dae06768434de5752aa"},
+    {file = "py-1.10.0-py2.py3-none-any.whl", hash = "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"},
+    {file = "py-1.10.0.tar.gz", hash = "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3"},
 ]
 pycodestyle = [
     {file = "pycodestyle-2.5.0-py2.py3-none-any.whl", hash = "sha256:95a2219d12372f05704562a14ec30bc76b05a5b297b21a5dfe3f6fac3491ae56"},
@@ -988,8 +995,8 @@ pyparsing = [
     {file = "pyparsing-2.4.6.tar.gz", hash = "sha256:4c830582a84fb022400b85429791bc551f1f4871c33f23e44f353119e92f969f"},
 ]
 pytest = [
-    {file = "pytest-5.3.5-py3-none-any.whl", hash = "sha256:ff615c761e25eb25df19edddc0b970302d2a9091fbce0e7213298d85fb61fef6"},
-    {file = "pytest-5.3.5.tar.gz", hash = "sha256:0d5fe9189a148acc3c3eb2ac8e1ac0742cb7618c084f3d228baaec0c254b318d"},
+    {file = "pytest-6.2.4-py3-none-any.whl", hash = "sha256:91ef2131a9bd6be8f76f1f08eac5c5317221d6ad1e143ae03894b862e8976890"},
+    {file = "pytest-6.2.4.tar.gz", hash = "sha256:50bcad0a0b9c5a72c8e4e7c9855a3ad496ca6a881a3641b4260605450772c54b"},
 ]
 pytest-cov = [
     {file = "pytest-cov-2.8.1.tar.gz", hash = "sha256:cc6742d8bac45070217169f5f72ceee1e0e55b0221f54bcf24845972d3a47f2b"},
@@ -1081,6 +1088,10 @@ sphinxcontrib-serializinghtml = [
     {file = "sphinxcontrib-serializinghtml-1.1.3.tar.gz", hash = "sha256:c0efb33f8052c04fd7a26c0a07f1678e8512e0faec19f4aa8f2473a8b81d5227"},
     {file = "sphinxcontrib_serializinghtml-1.1.3-py2.py3-none-any.whl", hash = "sha256:db6615af393650bf1151a6cd39120c29abaf93cc60db8c48eb2dddbfdc3a9768"},
 ]
+toml = [
+    {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
+    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
+]
 toolz = [
     {file = "toolz-0.10.0.tar.gz", hash = "sha256:08fdd5ef7c96480ad11c12d472de21acd32359996f69a5259299b540feba4560"},
 ]
@@ -1091,10 +1102,6 @@ urllib3 = [
 validators = [
     {file = "validators-0.14.2.tar.gz", hash = "sha256:b192e6bde7d617811d59f50584ed240b580375648cd032d106edeb3164099508"},
 ]
-wcwidth = [
-    {file = "wcwidth-0.1.8-py2.py3-none-any.whl", hash = "sha256:8fd29383f539be45b20bd4df0dc29c20ba48654a41e661925e612311e9f3c603"},
-    {file = "wcwidth-0.1.8.tar.gz", hash = "sha256:f28b3e8a6483e5d49e7f8949ac1a78314e740333ae305b4ba5defd3e74fb37a8"},
-]
 websockets = [
     {file = "websockets-8.1-cp36-cp36m-macosx_10_6_intel.whl", hash = "sha256:3762791ab8b38948f0c4d281c8b2ddfa99b7e510e46bd8dfa942a5fff621068c"},
     {file = "websockets-8.1-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:3db87421956f1b0779a7564915875ba774295cc86e81bc671631379371af1170"},
diff --git a/pyproject.toml b/pyproject.toml
index 456e8e3b..995ee536 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ mnemonic = "^0.19.0"
 munch = "^2.5"
 
 [tool.poetry.dev-dependencies]
-pytest = "^5.3"
+pytest = "^6.2"
 flake8 = "^3.7"
 pytest-cov = "^2.7"
 coverage = "^5.0"