Update dependency chalk to v4

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
chalk	devDependencies	major	^4.0.0	source

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Release Notes

chalk/chalk

v4.0.0

Compare Source

Breaking

• Require Node.js 10 61999a4
• Change the Level TypeScript type to be a union instead of enum f0f4638

-if (chalk.level > Level.None) {}
+if (chalk.level > 0) {}

Improvements

• Use Object.setPrototypeOf as __proto__ could potentially be disabled (#​387) 63469d3

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