readme update

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-paymaster-gateway-019/trunk@1012221 b8457f37-d9ea-0310-8a92-e5e31aec5664
new readme 020

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-paymaster-gateway-019/trunk@1012223 b8457f37-d9ea-0310-8a92-e5e31aec5664