Remove 3.5 python due to travis build issue

Author: LD250

.travis.yml

@@ -2,7 +2,6 @@ language: "python"
 python:
     - "2.7"
     - "3.4"
-    - "3.5"
     - "3.6"
 install:
     - pip install flake8 mock==2.0.0