Add Python 3 Train unit tests

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: I7d0a996b33d4d1eec436f92fbd390968cd37630c
Story: #2005924
Task: #34232

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 629b74d0..eaf66bc4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.3
-envlist = py37,py36,py27,pep8
+envlist = py27,py37,pep8
 skipdist = True
 
 [testenv]