add all supported versions of python

Author: tomato42

setup.py

@@ -100,5 +100,9 @@ def do(setup_statements, statement):
           "Programming Language :: Python :: 3.2",
           "Programming Language :: Python :: 3.3",
           "Programming Language :: Python :: 3.4",
+          "Programming Language :: Python :: 3.5",
+          "Programming Language :: Python :: 3.6",
+          "Programming Language :: Python :: 3.7",
+          "Topic :: Security :: Cryptography"
       ],
 )