Load a file akin to mocha.opts

[ORESoftware]

Hey @trentm

so I was wondering if dashdash is capable of loading a file like mocha.opts

https://github.com/mochajs/mocha/blob/master/test/mocha.opts

I am not sure if Mocha uses commander or minimist, but mocha will load that file, and use those command flags as default

furthermore, it would be cool if dashdash could interpret .env files, and the like.

[karfau]

A) mocha.opts file format has been deprecated by mocha
B) You can already use (something like) dotenv in the place where you are using dashdash and this way support anything that is using the existing env option
C) (not sure it's really relevant) mocha uses yargs

I don't think anything needs to be done.