readme.txt changes

git-svn-id: https://plugins.svn.wordpress.org/instant-feedback/trunk@818172 b8457f37-d9ea-0310-8a92-e5e31aec5664
changes readme.txt

git-svn-id: https://plugins.svn.wordpress.org/instant-feedback/trunk@818173 b8457f37-d9ea-0310-8a92-e5e31aec5664