Drop support for EOL Python 3.6 and 3.7 (#14)

.github/workflows/main.yml

@@ -33,18 +33,13 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
-          - "3.6"
-          - "3.7"
           - "3.8"
           - "3.9"
           - "3.10"
           - "3.11"
-          - "pypy-3.7"
           - "pypy-3.8"
           - "pypy-3.9"
-        # 20.04 because https://github.com/actions/python-versions
-        # does not have 3.6 binaries for 22.04.
-        os: ["ubuntu-20.04"]
+        os: ["ubuntu-22.04"]
         include:
           - { python-version: "3.12", os: "ubuntu-latest" }
     steps:

setup.cfg

@@ -28,8 +28,6 @@ classifiers =
     Natural Language :: English
     Operating System :: OS Independent
     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
@@ -41,7 +39,7 @@ classifiers =
     Topic :: Software Development :: Libraries :: Python Modules
 
 [options]
-python_requires = >=3.6
+python_requires = >=3.8
 zip_safe = True
 setup_requires = setuptools
 install_requires =

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 minversion = 3.5.0
 envlist =
-    py{36, 37, 38, 39, 310, 311, 312, py37, py38, py39}
+    py{38, 39, 310, 311, 312, py38, py39}
     cover, bandit, build
 isolated_build = true
 skip_missing_interpreters = true
@@ -39,13 +39,10 @@ commands =
 
 [gh-actions]
 python =
-    3.6: py36
-    3.7: py37
     3.8: py38
     3.9: py39
     3.10: py310, cover, build, bandit
     3.11: py311
     3.12: py312
-    pypy-3.7: pypy37
     pypy-3.8: pypy38
     pypy-3.9: pypy39