Fix link to bug tracker

Current link for bug tracking system returns 404,
the review fixes that.

Change-Id: I5f685f01d3ed39344fda784823faefabdbf7817f
diff --git a/README.rst b/README.rst
index f84f23f..de0ec32 100644
--- a/README.rst
+++ b/README.rst
@@ -10,7 +10,7 @@
 * Documentation: https://docs.openstack.org/manila/latest/
 * Release notes: https://docs.openstack.org/releasenotes/manila/
 * Source: https://opendev.org/openstack/manila-tempest-plugin
-* Bugs: https://bugs.launchpad.net/manila-tempest-plugin
+* Bugs: https://bugs.launchpad.net/manila
 
 Features
 --------