Fixed #427: updated django versions on tox to latest security release

Author: synasius

tox.ini

@@ -15,9 +15,9 @@ envlist =
 [testenv]
 commands=python runtests.py -q --cov=oauth2_provider --cov-report= --cov-append
 deps =
-    django18: Django==1.8.15
-    django19: Django==1.9.10
-    django110: Django==1.10.2
+    django18: Django==1.8.16
+    django19: Django==1.9.11
+    django110: Django==1.10.3
     coverage==4.1
     pytest-cov==2.3.0
     -rrequirements/testing.txt
@@ -26,7 +26,7 @@ deps =
 # coverage-4.1 doesn't support python-3.2.
 commands=python runtests.py -q
 deps =
-    django18: Django==1.8.15
+    django18: Django==1.8.16
     -rrequirements/testing.txt
 
 [testenv:docs]