Fix trove classifiers

Author: rpkilby

setup.cfg

@@ -55,10 +55,10 @@ classifiers =
     Framework :: Django :: 3.0
     Framework :: Django :: 3.1
     Intended Audience :: Developers
-    License :: OSI Approved :: MIT
+    License :: OSI Approved :: MIT License
     Operating System :: OS Independent
     Programming Language :: Python
-    Programming Language :: Python :: 3 :: only
+    Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7