added nyto group as contributor

git-svn-id: https://plugins.svn.wordpress.org/buffer-my-post/trunk@990995 b8457f37-d9ea-0310-8a92-e5e31aec5664
added nyto group as contributor in readme file

git-svn-id: https://plugins.svn.wordpress.org/buffer-my-post/trunk@990996 b8457f37-d9ea-0310-8a92-e5e31aec5664