chore: drop 3.6/3.7 python support

.github/workflows/ci-linux-ubuntu.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
     - uses: actions/checkout@v4

docs/about/CONTRIBUTING.md

@@ -105,7 +105,7 @@ Before you submit a pull request, check that it meets these guidelines:
 
 1. The pull request should include tests.
 2. If the pull request adds/changes functionality, the docs should be updated.
-3. The pull request should work for Python 3.6-3.10. Check
+3. The pull request should work for Python 3.8-3.12. Check
    https://travis-ci.org/igordejanovic/parglare/pull_requests and make sure that
    the tests pass for all supported Python versions.
 

pyproject.toml

@@ -22,8 +22,6 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Natural Language :: English",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
@@ -32,7 +30,7 @@ classifiers = [
     "Operating System :: OS Independent",
 ]
 
-requires-python = ">=3.6, <3.13"
+requires-python = ">=3.8, <3.13"
 dependencies = [
     "click >=7.0, <9.0"
 ]