Add additional trove classifiers for support Python version (#16)

Author: jdufresne

setup.py

@@ -24,10 +24,12 @@
 		'Intended Audience :: Developers',
 		'Topic :: Software Development :: Libraries :: Python Modules',
 
+		'Programming Language :: Python :: 2',
 		'Programming Language :: Python :: 2.7',
 		'Programming Language :: Python :: 3',
 		'Programming Language :: Python :: 3.4',
 		'Programming Language :: Python :: 3.5',
+		'Programming Language :: Python :: 3.6',
 	],
 
 	keywords="email address validator",