version 2.1.4

git-svn-id: https://plugins.svn.wordpress.org/mailchimp-for-wp/trunk@1006792 b8457f37-d9ea-0310-8a92-e5e31aec5664
updating readme with update message

git-svn-id: https://plugins.svn.wordpress.org/mailchimp-for-wp/trunk@1006798 b8457f37-d9ea-0310-8a92-e5e31aec5664