Update readme.txt.

git-svn-id: https://plugins.svn.wordpress.org/livesupporti/trunk@852052 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update tags.

git-svn-id: https://plugins.svn.wordpress.org/livesupporti/trunk@852054 b8457f37-d9ea-0310-8a92-e5e31aec5664