Add support for py313 (#171)

Author: abhikdps

pyproject.toml

@@ -25,6 +25,7 @@ classifiers = [
   'Programming Language :: Python :: 3.10',
   'Programming Language :: Python :: 3.11',
   'Programming Language :: Python :: 3.12',
+  'Programming Language :: Python :: 3.13',
   "Topic :: Documentation",
   "Topic :: Software Development :: Documentation",
   "Topic :: Text Processing :: Markup :: HTML",