update changelog

git-svn-id: https://plugins.svn.wordpress.org/starbox/trunk@1028128 b8457f37-d9ea-0310-8a92-e5e31aec5664
update readme description

git-svn-id: https://plugins.svn.wordpress.org/starbox/trunk@1028133 b8457f37-d9ea-0310-8a92-e5e31aec5664