test and add python 3.7, django 2.0, 2.1 and 2.2 in setup

Author: MorganeAD

setup.py

@@ -23,9 +23,13 @@
           "Programming Language :: Python :: 3.4",
           "Programming Language :: Python :: 3.5",
           "Programming Language :: Python :: 3.6",
+          "Programming Language :: Python :: 3.7",
           "Framework :: Django",
           "Framework :: Django :: 1.8",
           "Framework :: Django :: 1.9",
           "Framework :: Django :: 1.10",
-          "Framework :: Django :: 1.11"],
+          "Framework :: Django :: 1.11",
+          "Framework :: Django :: 2.0",
+          "Framework :: Django :: 2.1",
+          "Framework :: Django :: 2.2"],
       )