Add tested support for Python 3.12

Author: Delgan

.github/workflows/tests.yml

@@ -20,6 +20,7 @@ jobs:
         - '3.9'
         - '3.10'
         - '3.11'
+        - 3.12-dev
         - pypy-3.9
         include:
         - os: ubuntu-20.04

setup.py

@@ -46,6 +46,7 @@
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3 :: Only",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Programming Language :: Python :: Implementation :: CPython",