Adding reference for author link.

git-svn-id: https://plugins.svn.wordpress.org/listly/trunk@971187 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating upgrade notice with short summary.

git-svn-id: https://plugins.svn.wordpress.org/listly/trunk@971188 b8457f37-d9ea-0310-8a92-e5e31aec5664