update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/pimap/trunk@967164 b8457f37-d9ea-0310-8a92-e5e31aec5664
title

git-svn-id: https://plugins.svn.wordpress.org/pimap/trunk@967166 b8457f37-d9ea-0310-8a92-e5e31aec5664