update to version 0.2.9.1

git-svn-id: https://plugins.svn.wordpress.org/twitter-account-box/trunk@967747 b8457f37-d9ea-0310-8a92-e5e31aec5664
add changelog 0.2.9.1

git-svn-id: https://plugins.svn.wordpress.org/twitter-account-box/trunk@967748 b8457f37-d9ea-0310-8a92-e5e31aec5664