Advertise Python 3.6 support

Author: matyasselmeci

setup.py

@@ -106,6 +106,8 @@
         # that you indicate whether you support Python 2, Python 3 or both.
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.6',
     ],
 
     # This field adds keywords for your project which will appear on the