Add support for Python 3.11

Author: hugovk

.github/workflows/tests.yml

@@ -19,6 +19,7 @@ jobs:
             "3.8",
             "3.9",
             "3.10",
+            "3.11-dev",
             "pypy2",
         ]
         os: [ubuntu-latest]

setup.py

@@ -29,6 +29,7 @@ def local_scheme(version):
           "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 :: Communications :: Chat :: Internet Relay Chat",