Add Python 3 Train unit teststrain-em1.31.0

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: Idcfef4d6661e51ba36caa0885e36df3784e483ab
Story: #2005924
Task: #34234

1 files changed, 1 insertions, 0 deletions

diff --git a/setup.cfg b/setup.cfg
index a939f92..f6db819 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -13,6 +13,7 @@ classifier =
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
     Intended Audience :: Developers
     Environment :: Console