Update readme

git-svn-id: https://plugins.svn.wordpress.org/google-website-translator/trunk@1004667 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update readme

git-svn-id: https://plugins.svn.wordpress.org/google-website-translator/trunk@1004669 b8457f37-d9ea-0310-8a92-e5e31aec5664