Minor readme update

git-svn-id: https://plugins.svn.wordpress.org/quiz-master-next/trunk@870984 b8457f37-d9ea-0310-8a92-e5e31aec5664
Minor readme update

git-svn-id: https://plugins.svn.wordpress.org/quiz-master-next/trunk@870985 b8457f37-d9ea-0310-8a92-e5e31aec5664