setup: advertise compatibility with Python 3.5 and 3.6

Author: Baptiste Jonglez

setup.py

@@ -59,6 +59,8 @@
     'Programming Language :: Python :: 2.7',
     'Programming Language :: Python :: 3.3',
     'Programming Language :: Python :: 3.4',
+    'Programming Language :: Python :: 3.5',
+    'Programming Language :: Python :: 3.6',
     'Topic :: Internet :: WWW/HTTP',
     'Topic :: Internet :: WWW/HTTP :: Dynamic Content',
   ],