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: I3cb7d2c482cf6d57e01892b6ba0f76d9580ff53c
Story: #2005924
Task: #34216

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index a448970ac..1dea5f77b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 minversion = 2.5.0
 skipsdist = True
-envlist = pep8,py37,py36,py27,pypy
+envlist = pep8,py27,py37,pypy
 
 [testenv]
 usedevelop=True