Added Python 3.10 to the testing matrix (#414)

Author: hugovk

.github/workflows/codeqa-test.yml

@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-10.15, windows-latest]
-        python-version: [2.7, 3.6, 3.9, pypy2, pypy3]
+        python-version: ["2.7", "3.6", "3.9", "3.10-dev", pypy2, pypy3]
         exclude:
         - os: macos-11.0
           python-version: pypy2

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py27, py35, py36, py37, py38, py39, pypy, pypy3, flake8
+envlist = py27, py35, py36, py37, py38, py39, py310, pypy, pypy3, flake8
 minversion = 3.3.0
 skip_missing_interpreters = true