feat: Pass optional stats config to getStats().toJson()

[evocateur]

I figured if one is passing custom stats config, it really doesn't make sense to automatically filter only assetsByChunkName. Of course, you can pass both options explicitly and the result will still be filtered.

I also synchronized some docs, fixed a typo, and made the build work with Node v10 and upgraded webpack-cli.

• Add tests
• Add docs

This fixes #18

[ryan-roemer]

This looks fantastic @evocateur !

I've got one suggested code change. And, once the documentation in the code comments + README.md is updated I'm looking forward to do a new release!

(If you're too strapped for time to catch up the docs let me know, and I'll see if I have a moment for it. I'm already planning on a doing a big release for inspectpack with a new, dedicated DuplicatesPlugin, so my head's actually in the webpack game this week...)

[evocateur]

Thanks for mentioning inspectpack, digging through its code helped me realize my stats defaults were too broad. Been trying to migrate a Webpack v3 build system to v4 at work, and wanted to use this handy plugin to do a bunch of fancy serialization (without having to redirect stdout to a file, etc).

[ryan-roemer]

Hi @evocateur !

I was randomly checking something here and wondering why this PR got totally dropped on my end, then looked at the date and realized I was still in recent newborn baby mode 👶

At any rate, got this cleaned up, merged, and released (as [email protected]) before a year elapsed... 😂

Thanks and let me know if you hit any issues with the new feature!