recursively expands ${VARIABLES} within the value

[apm]

Fixes #39

[maxbeatty]

any way to add this without reorganizing the whole module? 😸

[apm]

Yeah, that was a bit rude, but the original has a function called dotenv that returns an object named dotenv. Not a fan of that. It is interesting it works since the inner dotenv is not declared.

[jcblw]

I do think the refactor is logical, but I would love to see the addition of this feature without it. Then maybe another pull request with the refactor. I just don't like that we essentially need to look over then entire modules code to code review the addition of a feature.

[apm]

Sure, I'll submit a new one with a proper diff.