Changed the version number to 1.3.3.7.

git-svn-id: https://plugins.svn.wordpress.org/fetch-tweets/trunk@845435 b8457f37-d9ea-0310-8a92-e5e31aec5664
Marked 1.3.3.7 as stable.

git-svn-id: https://plugins.svn.wordpress.org/fetch-tweets/trunk@845438 b8457f37-d9ea-0310-8a92-e5e31aec5664