feat: add trove classifier for python 3.9 and python 3.10 (#87)

Author: parthea

setup.py

@@ -62,6 +62,8 @@
         "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",
         "Topic :: Internet",
         "Topic :: Software Development :: Libraries :: Python Modules",
     ],