Update exchange URLs in readme


git-svn-id: https://plugins.svn.wordpress.org/woocommerce-and-1centerprise-data-exchange/trunk@1023014 b8457f37-d9ea-0310-8a92-e5e31aec5664
Change back exchange URLs in readme


git-svn-id: https://plugins.svn.wordpress.org/woocommerce-and-1centerprise-data-exchange/trunk@1023016 b8457f37-d9ea-0310-8a92-e5e31aec5664