chore: add Python 3.10 - 3.12 support and test environments

Author: rubik

README.rst

@@ -45,7 +45,7 @@ Or download the source and run the setup file (requires setuptools):
 
    $ python setup.py install
 
-Xenon is tested with Python versions **2.7** and **3.6** to **3.9** as well as
+Xenon is tested with Python versions **2.7** and **3.6** to **3.12** as well as
 **PyPy**.
 
 Usage

setup.py

@@ -44,6 +44,9 @@
           'Programming Language :: Python :: 3.7',
           'Programming Language :: Python :: 3.8',
           'Programming Language :: Python :: 3.9',
+          'Programming Language :: Python :: 3.10',
+          'Programming Language :: Python :: 3.11',
+          'Programming Language :: Python :: 3.12',
           'Topic :: Software Development',
           'Topic :: Software Development :: Libraries :: Python Modules',
           'Topic :: Software Development :: Quality Assurance',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py36,py37,py38,py39,pypy
+envlist = py27,py36,py37,py38,py39,py310,py311,py312,pypy
 
 [testenv]
 deps = -r{toxinidir}/tox_requirements.txt