Also test on Python 3.6

.travis.yml

@@ -1,15 +1,18 @@
 language: python
 
-# Python 3.5 specified to make tox environment 'py35' work.
+# Python versions specified to make tox environment 'py35' and 'py36' work.
 # See: https://github.com/travis-ci/travis-ci/issues/4794
-python:
-  - 3.5
-
 # Environment changes have to be manually synced with 'tox.ini'.
 # See: https://github.com/travis-ci/travis-ci/issues/3024
-env:
-  - TOXENV=py27
-  - TOXENV=py35
+
+matrix:
+  include:
+  - python: '2.7'
+    env: TOXENV=py27
+  - python: '3.5'
+    env: TOXENV=py35
+  - python: '3.6'
+    env: TOXENV=py36
 
 install:
   - pip install -r requirements.txt

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 # Environment changes have to be manually synced with '.travis.yml'.
-envlist = py27,py35
+envlist = py27,py35,py36
 
 [pytest]
 ;addopts = -v --cov pillarsdk --cov-report term-missing