updated readme

git-svn-id: https://plugins.svn.wordpress.org/multi-rating/trunk@909588 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme

git-svn-id: https://plugins.svn.wordpress.org/multi-rating/trunk@909590 b8457f37-d9ea-0310-8a92-e5e31aec5664