Switch testing to Victoria testing runtime

Updating the testing template from ussuri to victoria
testing runtime
- https://governance.openstack.org/tc/reference/runtimes/victoria.html

Change-Id: If964909a73a52836e3adbb7b695f1c7322b81830
diff --git a/setup.cfg b/setup.cfg
index f57a805..18427a2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -17,6 +17,7 @@
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython