readme update

git-svn-id: https://plugins.svn.wordpress.org/wpsso-ssb/trunk@962518 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme update

git-svn-id: https://plugins.svn.wordpress.org/wpsso-ssb/trunk@962522 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme update

git-svn-id: https://plugins.svn.wordpress.org/wpsso-ssb/trunk@962529 b8457f37-d9ea-0310-8a92-e5e31aec5664