Update to version 1.6.6

git-svn-id: https://plugins.svn.wordpress.org/rotatingtweets/trunk@820490 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating main file to version 1.6.6

git-svn-id: https://plugins.svn.wordpress.org/rotatingtweets/trunk@820492 b8457f37-d9ea-0310-8a92-e5e31aec5664