Updated the description.

git-svn-id: https://plugins.svn.wordpress.org/fetch-tweets/trunk@779010 b8457f37-d9ea-0310-8a92-e5e31aec5664
Tagged 1.3.0 as stable.

git-svn-id: https://plugins.svn.wordpress.org/fetch-tweets/trunk@779012 b8457f37-d9ea-0310-8a92-e5e31aec5664