Update dependency np to v6.3.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
np	devDependencies	minor	6.2.5 -> 6.3.1

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Release Notes

sindresorhus/np

### [`v6.3.1`](https://togithub.com/sindresorhus/np/releases/v6.3.1) [Compare Source](https://togithub.com/sindresorhus/np/compare/v6.3.0...v6.3.1) - Fix a regression from 6.3.0 ([#​552](https://togithub.com/sindresorhus/np/issues/552)) [`59edfe6`](https://togithub.com/sindresorhus/np/commit/59edfe6) ### [`v6.3.0`](https://togithub.com/sindresorhus/np/releases/v6.3.0) [Compare Source](https://togithub.com/sindresorhus/np/compare/v6.2.5...v6.3.0) - Fix specifying a custom version via UI ([#​546](https://togithub.com/sindresorhus/np/issues/546)) [`6b68244`](https://togithub.com/sindresorhus/np/commit/6b68244) - Respect `preId` in `.npmrc` for release tags ([#​547](https://togithub.com/sindresorhus/np/issues/547)) [`aebd8ab`](https://togithub.com/sindresorhus/np/commit/aebd8ab)

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[coveralls]

Coverage remained the same at 100.0% when pulling c07cdb77d1c86de461d80b994e2a12bb1a14bb04 on renovate/np-6.x into cbe7411fbcd5a017e94c9e291bac48334da636c2 on master.