Read .env files

[sloria]

Proposed API

env.read_env()  # searches for a .env in the file hierarchy, parses it into os.environ

Considerations

This is already implemented by envparse and django-environ (it's hard to tell, but I think original credit goes to the author of this gist: https://gist.github.com/bennylope/2999704).

I'm hesitant to just copy and paste the implementation from one of these sources into this library. I'm more inclined to release a separate library and just import that library here. That way, other libraries could reuse this code. Also, users may want to read .env files without having to use environs, envparse, etc.

[sloria]

I've released read_env. Users should use this library to read .env file; no need to add to environs' API.