Add python 3.6 to Pypi trove classifiers

Author: jeffwidman

setup.cfg

@@ -16,6 +16,7 @@ classifier =
     Programming Language :: Python :: 3.3
     Programming Language :: Python :: 3.4
     Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3.6
     Intended Audience :: Developers
     Environment :: Console
 keywords =