readme update

git-svn-id: https://plugins.svn.wordpress.org/plinks/trunk@907019 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme -

git-svn-id: https://plugins.svn.wordpress.org/plinks/trunk@907021 b8457f37-d9ea-0310-8a92-e5e31aec5664