Raise supported version to Python 3.11

At the present time, there is no reason why the maximum supported
version shouldn't be 3.11.

Author: crapitea

.github/workflows/pr_checks.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: [ '3.6', '3.7', '3.8', '3.9', '3.10' ]
+        python-version: [ '3.6', '3.7', '3.8', '3.9', '3.10', '3.11' ]
 
     steps:
     - name: Check out repository code
@@ -37,4 +37,4 @@ jobs:
         pipenv run pip list --local
 
     - name: Test with tox
-      run: pipenv run tox
+      run: pipenv run tox

setup.cfg

@@ -15,6 +15,7 @@ classifiers =
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
     License :: OSI Approved :: Apache Software License
     Operating System :: OS Independent
 

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 isolated_build = True
-envlist = py36, py37, py38, py39, py310
+envlist = py36, py37, py38, py39, py310, py311
 
 [gh-actions]
 python =
@@ -9,6 +9,7 @@ python =
     3.8: py38
     3.9: py39
     3.10: py310
+    3.11: py311
 
 [testenv]
 deps = pipenv