Added caveats to the readme.

git-svn-id: https://plugins.svn.wordpress.org/brown-paper-tickets-event-list/trunk@765888 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added caveats to the readme.

git-svn-id: https://plugins.svn.wordpress.org/brown-paper-tickets-event-list/trunk@765890 b8457f37-d9ea-0310-8a92-e5e31aec5664