updating readme file after compatibility check of plugin

git-svn-id: https://plugins.svn.wordpress.org/wordpress-protection/trunk@821865 b8457f37-d9ea-0310-8a92-e5e31aec5664
updating readme file after compatibility check of plugin

git-svn-id: https://plugins.svn.wordpress.org/wordpress-protection/trunk@821866 b8457f37-d9ea-0310-8a92-e5e31aec5664