Update Readme description

git-svn-id: https://plugins.svn.wordpress.org/izeechat/trunk@1017201 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update Readme description

git-svn-id: https://plugins.svn.wordpress.org/izeechat/trunk@1017202 b8457f37-d9ea-0310-8a92-e5e31aec5664