Pull request to editline

Hi Judah, I'm sending your an email, in case you haven't noticed GitHub notifications. I have a PR https://github.com/judah/haskeline/pull/153 (now opened for two months). It's blocking work on Data.List specialization. Also Ben have pinged you on https://github.com/judah/haskeline/issues/154 to make releases for 9.0.1 and 9.0.2. It would be very great if my patch could be merged and released, that should make editline ready for 9.2 and maybe even 9.4 (I think we are too late with refactor of Data.List for 9.2). - Oleg