Add 3.9 and 3.10 to supported Python versions

Author: rsnitsch

setup.py

@@ -47,6 +47,8 @@ def get_version(rel_path):
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3 :: Only',
     ],