Supporting only Python3.6

.travis.yml

@@ -3,17 +3,10 @@ language: python
 matrix:
   include:
     - os: linux
-      python: 3.5
-
-    - os: linux
       python: 3.6
 
     - os: osx
       language: generic
-      env: PYTHON_VERSION=3.5.3
-
-    - os: osx
-      language: generic
       env: PYTHON_VERSION=3.6.1
 
 install:

tox.ini

 [tox]
 skipsdist = True
-envlist = py35,py36
+envlist = py36
 
 [testenv]
 deps =