Add Django 1.11 to the Tox environments

Author: PiDelport

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
     py33-dj1.8,
-    py{27,34,35,36}-dj1.{8,9,10}
+    py{27,34,35,36}-dj1.{8,9,10,11}
 
 [testenv]
 commands=python {toxinidir}/test_project/manage.py test {posargs:test_app} --noinput
@@ -12,5 +12,6 @@ deps =
     dj1.8: Django ~=1.8.0
     dj1.9: Django ~=1.9.0
     dj1.10: Django ~=1.10.0
+    dj1.11: Django ~=1.11.0
 
     psycopg2