Add CI and docs for Python 3.6
diff --git a/setup.py b/setup.py
index c6f8759..66a779c 100644
--- a/setup.py
+++ b/setup.py
@@ -63,6 +63,7 @@
         'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: Implementation :: PyPy',
 
         'Topic :: Security :: Cryptography',