How to get PR merged

As my organization has a need for sending emails between different queues, I made some changes to the email loop protection in RT to allow emails between queues on the same RT server as long as the queues are different. I want to push this change upstream, as I believe this is useful for more people, so I made a pr (https://github.com/bestpractical/rt/pull/292), but I haven’t gotten any response. I’m not very familiar with open source development, is there something else I should do to push my patch upstream?