feat(deps): Drop Python 3.4 support (#108)

BREAKING CHANGE: drop Python 3.4 support in preparation for adding type hints and Django 3.1 support

Prereq for #107

.travis.yml

@@ -1,20 +1,14 @@
 language: python
 cache: pip
-dist: xenial
+dist: bionic
 install: pip install tox
 script: tox -e $TOX_ENV
 
 jobs:
   include:
-    - stage: test
-      python: 3.4
-      env: TOX_ENV=django18-py34
     - stage: test
       python: 3.5
       env: TOX_ENV=django18-py35
-    - stage: test
-      python: 3.4
-      env: TOX_ENV=django19-py34
     - stage: test
       python: 3.5
       env: TOX_ENV=django19-py35
@@ -27,9 +21,6 @@ jobs:
     - stage: test
       python: 3.6
       env: TOX_ENV=django111-py36
-    - stage: test
-      python: 3.4
-      env: TOX_ENV=django20-py34
     - stage: test
       python: 3.5
       env: TOX_ENV=django20-py35

setup.py

@@ -20,9 +20,9 @@
         "License :: OSI Approved :: Apache Software License",
         "Operating System :: OS Independent",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
     ],
 )

tox.ini

@@ -2,11 +2,11 @@
 # https://docs.djangoproject.com/en/dev/faq/install/#what-python-version-can-i-use-with-django
 [tox]
 envlist =
-    django18-{py34,py35},
-    django19-{py34,py35},
+    django18-{py35},
+    django19-{py35},
     django110-{py35},
     django111-{py35,py36},
-    django20-{py34,py35,py36,py37},
+    django20-{py35,py36,py37},
     django21-{py35,py36,py37},
     django22-{py36,py37},
     django30-{py36,py37,py38},