tslint output before creating file

[zeke]

This PR moves the responsibility of linting the electron.d.ts file into the module itself, so electron/electron will have fewer moving typescript parts.

The CLI now programmatically runs tslint on the generated output. If there are no errors, the file is written and the process exits with 0. If there are errors, they are printed and the process exits with 1.

cc @MarshallOfSound @kevinsawicki

[zeke]

~/electron/electron-typescript-definitions master ⇡ 20s
❯ np minor --yolo
 ✔ Prerequisite check
 ✔ Git
 ✔ Bumping version using Yarn
 ✔ Publishing package
 ✔ Pushing tags

 electron-typescript-definitions 1.2.0 published 🎉