Security fix https://vexatioustendencies.com/wordpress-plugin-vulnerability-dump-part-2/

git-svn-id: https://plugins.svn.wordpress.org/wp-to-twitter/trunk@988751 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update version number

git-svn-id: https://plugins.svn.wordpress.org/wp-to-twitter/trunk@988752 b8457f37-d9ea-0310-8a92-e5e31aec5664
Switch to 2.9.4; security fix

git-svn-id: https://plugins.svn.wordpress.org/wp-to-twitter/trunk@988756 b8457f37-d9ea-0310-8a92-e5e31aec5664