update read me file

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-predictive-search/trunk@853588 b8457f37-d9ea-0310-8a92-e5e31aec5664
update read me file

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-predictive-search/trunk@853589 b8457f37-d9ea-0310-8a92-e5e31aec5664