Added some Python versions to trove classifiers.

Author: jezdez

setup.py

@@ -54,6 +54,8 @@ def find_version(*parts):
         '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',
     ],
     install_requires=['django-appconf >= 0.4'],