* Add MailChimp beta notice to readme.txt in trunk

git-svn-id: https://plugins.svn.wordpress.org/restaurant-reservations/trunk@969601 b8457f37-d9ea-0310-8a92-e5e31aec5664
* Tweak the MailChimp beta notice language

git-svn-id: https://plugins.svn.wordpress.org/restaurant-reservations/trunk@969603 b8457f37-d9ea-0310-8a92-e5e31aec5664