updated the plugin version to 1.0.4

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-google-merchant-center-feed/trunk@810356 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-google-merchant-center-feed/trunk@810358 b8457f37-d9ea-0310-8a92-e5e31aec5664