update

git-svn-id: https://plugins.svn.wordpress.org/wp-facebook-like-ranking/trunk@821942 b8457f37-d9ea-0310-8a92-e5e31aec5664
upddate readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-facebook-like-ranking/trunk@821946 b8457f37-d9ea-0310-8a92-e5e31aec5664