Add Python 3.13 trove classifier (#535)

Author: edgarrmondragon

setup.py

@@ -50,6 +50,7 @@ def read_files(files):
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Intended Audience :: Developers',
         'Intended Audience :: System Administrators',