Add support for Python 3.10 (#248)

Author: hugovk

.github/workflows/ci.yml

@@ -57,7 +57,7 @@ jobs:
     needs: lint
     strategy:
       matrix:
-        pyver: [3.6, 3.7, 3.8, 3.9]
+        pyver: ["3.6", "3.7", "3.8", "3.9", "3.10"]
         os: [ubuntu, macos, windows]
         include:
           - pyver: pypy3

setup.py

@@ -35,11 +35,13 @@ def read(name):
         "License :: OSI Approved :: Apache Software License",
         "Intended Audience :: Developers",
         "Programming Language :: Python",
+        "Programming Language :: Python :: 3 :: Only",
         "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",
         "Topic :: Internet :: WWW/HTTP",
         "Framework :: AsyncIO",
     ],