Use readable-stream instead of through2

[shinnn]

This change reduces the package file size since readable-stream is one of the dependencies of through2. https://github.com/rvagg/through2/blob/v2.0.0/package.json#L23

[kevva]

Sexy.

[shinnn]

@kevva @sindresorhus Can we update your vinyl-related projects (e.g. gulp plugin) like this?

[sindresorhus]

Nah, I kinda like using through2 as its API is even simpler, and the savings you talk about are super minor. I'm gonna go through my gulp plugins and upgrade through2 tomorrow.

[shinnn]

@sindresorhus

Streams3 has a simplified constructor API (nodejs/readable-stream#102) and we can use it everywhere by using readable-stream v2.0.0. That seems enough simple for me and I think now through2 is almost finishing its roles in the point of simplicity.

[sindresorhus]

I'm aware, but through2 still have a tiny bit simpler API, so I don't really see the benefit of switching.

[shinnn]

@sindresorhus Also correct.

I'm gonna go through my gulp plugins and upgrade through2

👍

[shinnn]

the savings you talk about are super minor

True, if rvagg/through2#36 is merged.