Update README.rst
Update README.rst

Add some more information for 0.17.

Change-Id: Icb9ca84c5c158727980f3dfb72714be864367af4

savinash47/openstack-doc-tools,openstack/openstack-doc-tools,savinash47/openstack-doc-tools,savinash47/openstack-doc-tools,openstack/openstack-doc-tools