python 3.3 is past end-of-life

.travis.yml

@@ -9,10 +9,6 @@ env:
   - TOXENV=py27-django19-test
   - TOXENV=py27-django110-test
   - TOXENV=py27-django111-test
-  - TOXENV=py33-django15-test
-  - TOXENV=py33-django16-test
-  - TOXENV=py33-django17-test
-  - TOXENV=py33-django18-test
   - TOXENV=py34-django15-test
   - TOXENV=py34-django16-test
   - TOXENV=py34-django17-test
@@ -32,7 +28,6 @@ env:
   - TOXENV=py36-django111-test
   - TOXENV=py36-django20-test
   - TOXENV=py27-flake
-  - TOXENV=py33-flake
   - TOXENV=py34-flake
   - TOXENV=py35-flake
   - TOXENV=py36-flake

tox.ini

@@ -2,10 +2,9 @@
 # Remember to add to .travis.yml if this is added to.
 envlist =
     py27-django{14,15,16,17,18,19,110,111}-test,
-    py33-django{15,16,17,18}-test,
     py34-django{15,16,17,18,19,110,111,20}-test,
     {py35,py36}-django{18,19,110,111,20}-test,
-    {py27,py33,py34,py35,py36}-flake,
+    {py27,py34,py35,py36}-flake,
     checkmanifest,
 
 [flake8]
@@ -16,7 +15,6 @@ exclude=mailer/south_migrations,mailer/migrations,build
 [testenv]
 basepython =
     py27: python2.7
-    py33: python3.3
     py34: python3.4
     py35: python3.5
     py36: python3.6