4.0 readme update

git-svn-id: https://plugins.svn.wordpress.org/sort-page-list-by-last-name/trunk@980903 b8457f37-d9ea-0310-8a92-e5e31aec5664
4.0 readme update

git-svn-id: https://plugins.svn.wordpress.org/sort-page-list-by-last-name/trunk@980905 b8457f37-d9ea-0310-8a92-e5e31aec5664