also remove py3.6 pypi classifier

Author: mahmoud

setup.py

@@ -44,7 +44,6 @@
           'Intended Audience :: Developers',
           'Topic :: Software Development :: Libraries',
           'Development Status :: 5 - Production/Stable',
-          'Programming Language :: Python :: 3.6',
           'Programming Language :: Python :: 3.7',
           'Programming Language :: Python :: 3.8',
           'Programming Language :: Python :: 3.9',