readme.txt update

git-svn-id: https://plugins.svn.wordpress.org/facebook-star-rating-light/trunk@949659 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt update

git-svn-id: https://plugins.svn.wordpress.org/facebook-star-rating-light/trunk@949661 b8457f37-d9ea-0310-8a92-e5e31aec5664