Fix Python version in setup.py

Author: aaltat

setup.py

@@ -11,10 +11,10 @@
 License :: OSI Approved :: Apache Software License
 Operating System :: OS Independent
 Programming Language :: Python :: 3
-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
 Programming Language :: Python :: Implementation :: CPython
 Programming Language :: Python :: Implementation :: PyPy