test against latest sub release of Django

Author: ticosax

tox.ini

@@ -11,7 +11,7 @@ setenv =
 deps =
        django1.6: Django==1.6.8
        django1.7: Django==1.7.1
-       django1.8: Django==1.8
+       django1.8: Django==1.8.1
        drf2.4.3: djangorestframework==2.4.3
        drf2.4.4: djangorestframework==2.4.4
        drf3.0: djangorestframework==3.0.5