Also test with Python 3.5 and 3.6, don't allow failures any more.

Since the tests seem to be passing with 3.4.

Author: jsm28

.travis.yml

@@ -2,10 +2,8 @@ language: python
 python:
   - 2.7
   - 3.4
-
-matrix:
-  allow_failures:
-    - python: 3.4
+  - 3.5
+  - 3.6
 
 sudo: false