update readme.txt  message

git-svn-id: https://plugins.svn.wordpress.org/protect-wp-admin/trunk@1035891 b8457f37-d9ea-0310-8a92-e5e31aec5664
update readme.txt  message

git-svn-id: https://plugins.svn.wordpress.org/protect-wp-admin/trunk@1035892 b8457f37-d9ea-0310-8a92-e5e31aec5664