the mod was last updated 1 year ago, i cant confidently say its confirmed but likely it has been abandoned once the mod was in a good enough state.
at least personally im not holding out to see it update even tho i would like to be able to continue using it.
Its licenced under MIT and i reckon the only changes it really needs is maybe a few prototype definitions and the changes to the api interface, which probably wouldnt be too much work.
So if someone is up to it they can port the mod them self to a 2.1 version.