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, 0 deletions

diff --git a/setup.cfg b/setup.cfg
index b4605c2..ce28c7c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -18,6 +18,7 @@ classifier =
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
     Topic :: Internet :: Name Service (DNS)
 
 [global]