add 3.6 to setup classifiers

Author: samuelcolvin

setup.py

@@ -20,6 +20,7 @@
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
         'Intended Audience :: Developers',
         'Intended Audience :: Information Technology',
         'Intended Audience :: System Administrators',