add python 3.6 unit test job

This is a mechanically generated patch to add a unit test job running
under Python 3.6 as part of the python3-first goal.

See the python3-first goal document for details:
https://governance.openstack.org/tc/goals/stein/python3-first.html

Change-Id: I91a737a5a204bc202faadccd22bafa4aee5e7332
Story: #2002586

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 5f7d29c..5a46e8c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.0
-envlist = py35,py27,pep8
+envlist = py35,py36,py27,pep8
 skipsdist = True
 
 [testenv]