shortened readme update

git-svn-id: https://plugins.svn.wordpress.org/links-auditor/trunk@920031 b8457f37-d9ea-0310-8a92-e5e31aec5664
shortened readme update

git-svn-id: https://plugins.svn.wordpress.org/links-auditor/trunk@920032 b8457f37-d9ea-0310-8a92-e5e31aec5664
edited readme

git-svn-id: https://plugins.svn.wordpress.org/links-auditor/trunk@920033 b8457f37-d9ea-0310-8a92-e5e31aec5664