Add support for modularscale-sass 3.x

[patrickcate]

It would be nice if Typi supported the latest 3.x version of modularscale-sass.

[zellwk]

Sounds good. Let me find time for this. You could also send a PR if you're cool with that :)

[strarsis]

@zellwk: Is the branch 'three' in this repository the WIP branch for modular scale 3.x integration?

[zellwk]

@strarsis nope. I don't think so. It's been so long since I worked on Typi that I can't really remember, unfortunately.

[strarsis]

@zellwk: Are there plans for finishing support for modular scale 3.x in the near future? 🐱

[zellwk]

Nope. I don't have the space to work on this project for the upcoming half year 😢