tweaks to readme

git-svn-id: https://plugins.svn.wordpress.org/users-ultra/trunk@955143 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt

git-svn-id: https://plugins.svn.wordpress.org/users-ultra/trunk@955144 b8457f37-d9ea-0310-8a92-e5e31aec5664