Allow importing packages through github urls

[rcoopr]

A feature of npm/package.json is being able to import code through github urls.
https://docs.npmjs.com/cli/v7/configuring-npm/package-json#git-urls-as-dependencies

Currently I run into the error 'relative module specifiers must start with "./"' etc.

This is my preferred method for sharing internal code without going through the extra setup of publishing packages to npm and adds the possibility of having private packages in that sense.