updating readme

git-svn-id: https://plugins.svn.wordpress.org/edd-discounts-by-location/trunk@1056734 b8457f37-d9ea-0310-8a92-e5e31aec5664
updating readme

git-svn-id: https://plugins.svn.wordpress.org/edd-discounts-by-location/trunk@1056735 b8457f37-d9ea-0310-8a92-e5e31aec5664