Add support for Python 3.10 (jpadilla#699)

Author: hugovk

.github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         platform: ["ubuntu-latest", "windows-latest"]
-        python-version: ["3.6", "3.7", "3.8", "3.9"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
 
     steps:
       - uses: "actions/checkout@v2"

setup.cfg

@@ -27,6 +27,7 @@ classifiers =
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Topic :: Utilities
 
 [options]

tox.ini

@@ -12,6 +12,7 @@ python =
     3.7: py37, docs
     3.8: py38, typing
     3.9: py39
+    3.10: py310
 
 
 [tox]