adjusting readme

git-svn-id: https://plugins.svn.wordpress.org/thirstyaffiliates/trunk@764103 b8457f37-d9ea-0310-8a92-e5e31aec5664
adjusting readme

git-svn-id: https://plugins.svn.wordpress.org/thirstyaffiliates/trunk@764106 b8457f37-d9ea-0310-8a92-e5e31aec5664