readme update

git-svn-id: https://plugins.svn.wordpress.org/wpsso/trunk@846164 b8457f37-d9ea-0310-8a92-e5e31aec5664
2.0rc8

git-svn-id: https://plugins.svn.wordpress.org/wpsso/trunk@846170 b8457f37-d9ea-0310-8a92-e5e31aec5664