Added "Python 3 Only" trove classifier.
@@ -64,6 +64,7 @@ setup(
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.5',
'Programming Language :: Python :: 3.6',
+ 'Programming Language :: Python :: 3 :: Only',
'Topic :: Internet :: WWW/HTTP',
'Topic :: Internet :: WWW/HTTP :: Dynamic Content',
'Topic :: Internet :: WWW/HTTP :: WSGI',
