4.0 readme update

git-svn-id: https://plugins.svn.wordpress.org/show-authors-in-page-list/trunk@980899 b8457f37-d9ea-0310-8a92-e5e31aec5664
4.0 readme update

git-svn-id: https://plugins.svn.wordpress.org/show-authors-in-page-list/trunk@980902 b8457f37-d9ea-0310-8a92-e5e31aec5664