Add classifier for Python 3.5 in setup.py (#366)

Author: sbellem

setup.py

@@ -42,6 +42,7 @@ def read(fname):
                  'Programming Language :: Python :: 3.2',
                  'Programming Language :: Python :: 3.3',
                  'Programming Language :: Python :: 3.4',
+                 'Programming Language :: Python :: 3.5',
                  ],
     # the following makes a plugin available to py.test
     entry_points={'pytest11': ['django = pytest_django.plugin']})