no longer supported

git-svn-id: https://plugins.svn.wordpress.org/sisow-for-woocommerce/trunk@910271 b8457f37-d9ea-0310-8a92-e5e31aec5664
added: maestro/mastercard/visa

git-svn-id: https://plugins.svn.wordpress.org/sisow-for-woocommerce/trunk@910273 b8457f37-d9ea-0310-8a92-e5e31aec5664
add logo maestro

git-svn-id: https://plugins.svn.wordpress.org/sisow-for-woocommerce/trunk@910275 b8457f37-d9ea-0310-8a92-e5e31aec5664