Update python trove classifiers

Author: ckrybus

setup.py

@@ -38,7 +38,13 @@ def readme():
         'License :: OSI Approved :: GNU Lesser General Public License v2 (LGPLv2)',
         'Natural Language :: English',
         'Programming Language :: Python',
+        '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',
+        'Programming Language :: Python :: 3.7',
         'Framework :: Django',
         'Framework :: Django :: 1.8',
         'Framework :: Django :: 1.9',