Readme update

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-pricefiles/trunk@955636 b8457f37-d9ea-0310-8a92-e5e31aec5664
Readme update

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-pricefiles/trunk@955638 b8457f37-d9ea-0310-8a92-e5e31aec5664