Updated readme.txt to newest version.

git-svn-id: https://plugins.svn.wordpress.org/wpmu-no-nag/trunk@889837 b8457f37-d9ea-0310-8a92-e5e31aec5664
1.2.1 update - I really need to check these things before I commit!

git-svn-id: https://plugins.svn.wordpress.org/wpmu-no-nag/trunk@889838 b8457f37-d9ea-0310-8a92-e5e31aec5664