Update dependencies and devDependencies

I updated [`he`](https://github.com/mathiasbynens/he), [`minimist`](https://github.com/substack/minimist), [`tap`](https://github.com/isaacs/node-tap) and [`mkdirp`](https://github.com/substack/node-mkdirp) to the latest version.

Okay, word.

I'll try to merge this tonight.