committing v3.9.9

git-svn-id: https://plugins.svn.wordpress.org/wordpress-simple-paypal-shopping-cart/trunk@947589 b8457f37-d9ea-0310-8a92-e5e31aec5664
updating version in readme file

git-svn-id: https://plugins.svn.wordpress.org/wordpress-simple-paypal-shopping-cart/trunk@947590 b8457f37-d9ea-0310-8a92-e5e31aec5664