Add support for Python 3.7

Author: davesque

README.rst

@@ -21,7 +21,7 @@ variable defaults should be safe.
 Requirements
 ------------
 
-* Python (2.7, 3.4, 3.5, 3.6)
+* Python (2.7, 3.5, 3.6, 3.7)
 * Django (1.11, 2.0, 2.1)
 * Django REST Framework (3.5, 3.6, 3.7, 3.8, 3.9)
 

tox.ini

@@ -3,9 +3,9 @@ addopts=--tb=short
 
 [tox]
 envlist =
-       py{27,34,35,36}-django111-drf{35,36,37,38},
-       py{34,35,36}-django20-drf{37,38},
-       py36-django{21,master}-drf{38,39},
+       py{27,35,36}-django111-drf{35,36,37,38},
+       py{35,36,37}-django20-drf{37,38},
+       py37-django{21,master}-drf{38,39},
        lint
 
 [travis:env]