arda There's no point in making it compatible with beta 8 right now, as
1) Flarum Discuss is most definitely not on the latest dev-master (too buggy or unstable), and
2) There are still going to be major changes coming for beta 8 in master, so there's no reason to rewrite anything twice more
Either way, I think the topic of the extension's author being active and/or updating it would be more appropriate in the extension's discussion. This discussion is about adding it to Flarum Discuss, specifically.
Apologies if this is not the case.