feat: add trove classifier for python 3.9 and python 3.10 (#77)

Author: parthea

setup.py

@@ -65,6 +65,8 @@
  "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",
  ],