Update setup.py classifiers (#987)

Fixes #985

Author: jkimbo

setup.py

@@ -48,10 +48,14 @@
         "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",
+        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: Implementation :: PyPy",
+        "Framework :: Django",
+        "Framework :: Django :: 1.11",
+        "Framework :: Django :: 2.2",
+        "Framework :: Django :: 3.0",
     ],
     keywords="api graphql protocol rest relay graphene",
     packages=find_packages(exclude=["tests"]),