[setup] Add python 3.6 classifier

setup.py

@@ -130,6 +130,7 @@ setup(
         'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
     ],
 
     cmdclass={'build_lazy_extractors': build_lazy_extractors},