feat: Relative path format

[SleepWalker]

It is nice, when you have project directory in relative path, e.g. my-project/foo/bar.js, but most of the time you are interested in path relative to project root, without including root dir name, e.g. foo/bar.js.

I propose to implement option, that will control whether user wants project's root name in relative path.

I can implement this settings, if the PR will be accepted