fixed readme

git-svn-id: https://plugins.svn.wordpress.org/random-messages/trunk@753344 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed comment

git-svn-id: https://plugins.svn.wordpress.org/random-messages/trunk@753345 b8457f37-d9ea-0310-8a92-e5e31aec5664