Add support for Python 3.12

Author: hugovk

.github/workflows/tests.yml

@@ -18,13 +18,15 @@ jobs:
           - "pypy3.9"
           - "3.10"
           - "3.11"
+          - "3.12"
 
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip

pyproject.toml

@@ -21,6 +21,7 @@ classifiers = [
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
   "Topic :: Security :: Cryptography",

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 # Environment changes have to be manually synced with '.travis.yml'.
-envlist = py37,py38,py39,py310,py311
+envlist = py{37,38,39,310,311,312}
 isolated_build = True
 
 [pytest]