It's highly unlikely that you get 3.1.1 using git. That's just the reported version because the maintainer did not update the version number to something like 3.1.2-dev, or whatever, before starting to fix stuff.
If you want to use composer, I would suggest to install dev-master. Alternatively (or additionally) you could get in touch with the maintainer and ask them to release a new version.

If it helps, I am the previous maintainer and I am happy with the request.
I am also available to discuss the design, if needed. Whatever I remember, anyway.