Fix tox.ini envlist: 3.0 -> 3.0.0.

Author: Brandon Cazander

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
        py27-{flake8,docs},
-       {py27,py33,py34}-django{1.6,1.7}-drf{2.4.3,2.4.4,3.0}
+       {py27,py33,py34}-django{1.6,1.7}-drf{2.4.3,2.4.4,3.0.0}
 
 [testenv]
 commands = ./runtests.py --fast