Add support for Python 3.11 (#195)

Author: wRAR

.github/workflows/tests.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "pypy3"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11.0-rc.2", "pypy3"]
 
     steps:
     - uses: actions/checkout@v2

setup.py

@@ -28,6 +28,7 @@
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Topic :: Internet :: WWW/HTTP",