Change the way CSS was added

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-easy-booking-system/trunk@998621 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-easy-booking-system/trunk@998623 b8457f37-d9ea-0310-8a92-e5e31aec5664