updated trunk readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-columnize/trunk@906524 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated trunk/readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-columnize/trunk@906526 b8457f37-d9ea-0310-8a92-e5e31aec5664