fixed readme

git-svn-id: https://plugins.svn.wordpress.org/easy-digital-download-shortcode-menu/trunk@855303 b8457f37-d9ea-0310-8a92-e5e31aec5664
2.2.2

git-svn-id: https://plugins.svn.wordpress.org/easy-digital-download-shortcode-menu/trunk@855305 b8457f37-d9ea-0310-8a92-e5e31aec5664