Remove ties to panko

in order to remove and retire panko.

Change-Id: I8bc2981f01a4b068272cddfa2026860c97a3355e
diff --git a/README.rst b/README.rst
index 0425bf4..2fe20b8 100644
--- a/README.rst
+++ b/README.rst
@@ -4,7 +4,7 @@
 
 Tempest plugin for Telemetry Project.
 
-It contains tempest tests for Aodh, Ceilometer, Gnocchi and Panko Projects.
+It contains tempest tests for Aodh, Ceilometer, and Gnocchi Projects.
 
 * Free software: Apache license
 * Documentation: https://docs.openstack.org/ceilometer/latest/