Remove tags from README

The tags framework has been discontinued [1].

[1] https://governance.openstack.org/tc/reference/tags/index.html

Change-Id: Ife108e6ae191641b56e872e4616a3f4ec78281e8
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

Author: stephenfin

README.rst

@@ -2,11 +2,6 @@
 Team and repository tags
 ========================
 
-.. image:: https://governance.openstack.org/tc/badges/python-openstackclient.svg
-    :target: https://governance.openstack.org/tc/reference/tags/index.html
-
-.. Change things from this point on
-
 ===============
 OpenStackClient
 ===============