How to contribute, is this up to date?

Since the latest commit to this repo is from 2 years ago, and fakevim seems to be mentioned in QtCreator's changelogs at points more recent, I'm curious whether this codebase is up to date with what QtCreator (e.g. 4.0) is actually using. What's the best way to go about making a contribution?

I'm really feeling the lack of the argument text object (a), daa to remove a function argument instantly is fantastic. Also surround, and the line text object. Other than surround these should be quite easy to add.