add 3.9 and 3.10 to supported

Author: hjwp

setup.py

@@ -35,6 +35,8 @@ def read(fname):
         "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",
         "Operating System :: OS Independent",
         "License :: Public Domain",
     ],