updates to the readme

git-svn-id: https://plugins.svn.wordpress.org/wp-old-post-date-remover/trunk@996367 b8457f37-d9ea-0310-8a92-e5e31aec5664
updates to the readme

git-svn-id: https://plugins.svn.wordpress.org/wp-old-post-date-remover/trunk@996368 b8457f37-d9ea-0310-8a92-e5e31aec5664