update django 1.8 coverage to the latest version

Author: crccheck

Diff for: tox.ini

@@ -20,11 +20,11 @@ deps =
     django-extensions==1.4.6
     factory-boy==2.4.1
     coveralls: coverage
-    django14: Django>=1.4,<1.5
-    django15: Django>=1.5,<1.6
-    django16: Django>=1.6,<1.7
-    django17: Django>=1.7,<1.8
-    django18: Django==1.8c1
+    django14: Django<1.5
+    django15: Django<1.6
+    django16: Django<1.7
+    django17: Django<1.8
+    django18: Django<1.9
 
 [testenv:coveralls-django17-py27]
 commands =