Correct 1.3 readme boondoggle in trunk

git-svn-id: https://plugins.svn.wordpress.org/event-rocket/trunk@877441 b8457f37-d9ea-0310-8a92-e5e31aec5664
Improve readme wording

git-svn-id: https://plugins.svn.wordpress.org/event-rocket/trunk@877442 b8457f37-d9ea-0310-8a92-e5e31aec5664