Update chalk to the latest version 🚀

[greenkeeper]

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☝️ Important announcement: Greenkeeper will be saying goodbye 👋 and passing the torch to Snyk on June 3rd, 2020! Find out how to migrate to Snyk and more at greenkeeper.io

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The dependency chalk was updated from 2.4.2 to 4.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Publisher: sindresorhus
License: MIT

Find out more about this release.

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[agilgur5]

Node 10+. All deps are starting to drop <10 EoL so we will in next big deps release (might do all the Node 10 ones at once, but idk about the rest that are more breaking).

None of the chalk methods etc that had breaking changes in v3 or v4 affect our usage.
The imports change in v3 TS might break some things. EDIT: Yes, pretty sure we'll need to change from import chalk from 'chalk' to import * as chalk from 'chalk';

Oh and greenkeper is bugging out because it didn't update the yarn.lock file for some reason, only the package.json, which is why CI is erroring (yarn error when using --frozen-lockfile with incompatible package.json)

[agilgur5]

Superseded by #678