Add Python 3 Train unit tests2.12.0

This is a mechanically generated patch to ensure unit testing is in place
for all of the Tested Runtimes for Train.

See the Train python3-updates goal document for details:
https://governance.openstack.org/tc/goals/train/python3-updates.html

Change-Id: Ie2119dec469dba059fa3ce8729f360590d45791c
Story: #2005924
Task: #34204

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 93b2561..8dc55d7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py36,py27,flake8
+envlist = py27,py37,flake8
 minversion = 2.0
 skipsdist = True