Remove Python 2 from PyPI classifiers

Author: miguelgrinberg

setup.py

@@ -52,7 +52,6 @@
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 3',
         'Topic :: Internet :: WWW/HTTP :: Dynamic Content',
         'Topic :: Software Development :: Libraries :: Python Modules'