fix(deps): update dependency untildify to v4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
untildify	^3.0.3 -> ^4.0.0

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Release Notes

sindresorhus/untildify

### [`v4.0.0`](https://togithub.com/sindresorhus/untildify/releases/v4.0.0) [Compare Source](https://togithub.com/sindresorhus/untildify/compare/v3.0.3...v4.0.0) Breaking: - Require Node.js 8 ([#​17](https://togithub.com/sindresorhus/untildify/issues/17)) [`f9fbec5`](https://togithub.com/sindresorhus/untildify/commit/f9fbec5) Enhancements: - Add TypeScript definition ([#​17](https://togithub.com/sindresorhus/untildify/issues/17)) [`f9fbec5`](https://togithub.com/sindresorhus/untildify/commit/f9fbec5)

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