Allow .nycrc.json

[bensaufley]

I'd like to be able to save my .nycrc as a .json file for automatic file type detection in VIM, Visual Studio Code, etc. This is a feature request, not a bug, but for consistency:

Expected Behavior

I put my configuration, JSON-formatted, in .nycrc.json and nyc respects that configuration when I run npm test, which in turn runs nyc nf mocha (nf for node-foreman)

Observed Behavior

nyc does not notice .nycrc.json as a configuration file (looking for .nycrc only), and falls back to default behavior.

Bonus Points! Code (or Repository) that Reproduces Issue

My repo (with .nycrc, no .json because as stated that doesn't work) can be found here.

Forensic Information

Operating System: MacBook Pro, macOS 10.12.4. zsh in Terminal for my command line, to be thorough.
Environment Information: nvm running node 6.1.0; yarn for dependencies

[bcoe]

@bensaufley this is totally a think now \o/ thanks for helping to implement it.

I've recently setup a community slack (see README.md) if you feel like staying in touch and contributing more to these projects.