update classifiers

Author: SkypLabs

setup.py

@@ -28,6 +28,10 @@
         'Intended Audience :: Developers',
         'Topic :: Software Development :: Libraries :: Python Modules',
         'Programming Language :: Python :: 3 :: Only',
+        'Programming Language :: Python :: 3.3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
         'License :: OSI Approved :: MIT License',
     ],
     packages = find_packages(exclude=['docs', 'tests', 'tests.*']),