updated readme

git-svn-id: https://plugins.svn.wordpress.org/wishpond-social-campaigns/trunk@890932 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme

git-svn-id: https://plugins.svn.wordpress.org/wishpond-social-campaigns/trunk@890933 b8457f37-d9ea-0310-8a92-e5e31aec5664