corrected order in readme.txt

git-svn-id: https://plugins.svn.wordpress.org/mailpoet-bbpress-add-on/trunk@887931 b8457f37-d9ea-0310-8a92-e5e31aec5664
corrected readme.txt

git-svn-id: https://plugins.svn.wordpress.org/mailpoet-bbpress-add-on/trunk@887932 b8457f37-d9ea-0310-8a92-e5e31aec5664