I've been maintaining this for a year or so, and it's been a good ride. However, I no longer feel I can be an effective maintainer for various reasons including time commitments. Looking for volunteers.
If you've developed on this plugin before please feel free to answer on https://github.com/jenkinsci/ghprb-plugin/issues/560. This plugin is used by a number of impressive organizations with a commitment to open source development; it will be a solid experience for whomever decides to volunteer.