feat: require Node 10.12.0

[malept]

BREAKING CHANGE: Drops support for Node < 10.12.0

This allows us to drop two direct dependencies (cuint and mkdirp), plus I found a way to drop a third (tmp-promise) that was unrelated to the Node version change.

Also uses stream.pipeline (added in Node 10) which simplifies how Filesystem.prototype.insertFile is implemented.

[MarshallOfSound]

This unreasonably concerns me as I don't think the asar tests are solid enough for this kind of change. I'd like electron's test suite to run against this version of asar before we consider publishing it

[malept]

I'd like electron's test suite to run against this version of asar before we consider publishing it

Done: electron/electron#22351

The only check that failed was Archaeologist, which can be fixed with electron/archaeologist#16 ETA: This has been merged & Archaeologist passes.

[malept]

Also want to point out that tests are passing, AppVeyor is a red herring due to #189 (comment)

[MarshallOfSound]

cc @zcbenz

[zcbenz]

I changed Appveyor's setting to "Skip branches without appveyor.yml", so the appveyor errors should be gone in future.

[electron-bot]

🎉 This PR is included in version 3.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀