chalk > colors

As discussed with @HenrikJoreteg on gitter. For reference, link to [chalk](https://github.com/sindresorhus/chalk).

`chalk` vs `colors` to me boils down to a distaste for extending core prototypes.
"Doesn't extend String.prototype"

Other benefits include easier readability and maintainability. It's much simpler to determine which strings have a style applied with `chalk` via common find.