Add Python 3.10 to test matrix & classifier list

.github/workflows/main.yml

@@ -23,6 +23,8 @@ jobs:
             python: "3.8"
           - os: ubuntu
             python: "3.9"
+          - os: ubuntu
+            python: "3.10"
           - os: macos
             python: "3.7"
           - os: windows

setup.py

@@ -69,6 +69,8 @@ setup(
         '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',
         'Programming Language :: Python :: Implementation :: CPython',
         'Topic :: Internet :: WWW/HTTP',
         'Topic :: Software Development :: Libraries :: Python Modules',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{3.6,3.7,3.8,3.9},docs,flake8
+envlist = py{3.6,3.7,3.8,3.9,3.10},docs,flake8
 
 [testenv]
 basepython =
@@ -7,6 +7,7 @@ basepython =
     py3.7: python3.7
     py3.8: python3.8
     py3.9: python3.9
+    py3.10: python3.10
 passenv = *
 usedevelop=True
 deps =