Update dependency read-pkg-up to v5

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
read-pkg-up	dependencies	major	^4.0.0 -> ^5.0.0	source

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Release Notes

sindresorhus/read-pkg-up

### [`v5.0.0`](https://togithub.com/sindresorhus/read-pkg-up/releases/v5.0.0) [Compare Source](https://togithub.com/sindresorhus/read-pkg-up/compare/v4.0.0...v5.0.0) Breaking: - Require Node.js 8 [`4412fe2`](https://togithub.com/sindresorhus/read-pkg-up/commit/4412fe2)

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