Update readme.txt.

git-svn-id: https://plugins.svn.wordpress.org/livesupporti/trunk@875505 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update readme.txt.

git-svn-id: https://plugins.svn.wordpress.org/livesupporti/trunk@875507 b8457f37-d9ea-0310-8a92-e5e31aec5664