edited readme

git-svn-id: https://plugins.svn.wordpress.org/admin-menu-post-list/trunk@971520 b8457f37-d9ea-0310-8a92-e5e31aec5664
edited readme

git-svn-id: https://plugins.svn.wordpress.org/admin-menu-post-list/trunk@971521 b8457f37-d9ea-0310-8a92-e5e31aec5664
edited readme

git-svn-id: https://plugins.svn.wordpress.org/admin-menu-post-list/trunk@971522 b8457f37-d9ea-0310-8a92-e5e31aec5664