`pnpm` support as package manager

[baxyz]

• I'm submitting a ...
  [ ] bug report
  [x] feature request
  [ ] question about the decisions made in the repository
  [ ] question about how to use this project

• Summary

It could be nice to support pnpm as package manager, in addition of npm and yarn

• Other information (e.g. detailed explanation, stack traces, related issues, suggestions how to fix, links for us to have context, eg. StackOverflow, personal fork, etc.)

[BaderBC]

Hi @baxyz, I'm happy to inform you that I've started working on this issue.

Currently, I need to fix tests, and everything should work ;)

[baxyz]

It's great! Thanks a lot.

[BuZZ-dEE]

I need it now. 😉

[BaderBC]

I need it now. 😉

Hi @BuZZ-dEE

I finished my work, pull request is already sent, everything depends on @bitjson

But if you really need this, you can clone my fork of this repo and install it globally on your device 😉