Update dependency np to v6.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
np	devDependencies	minor	6.3.2 -> 6.4.0

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Release Notes

sindresorhus/np

### [`v6.4.0`](https://togithub.com/sindresorhus/np/releases/v6.4.0) [Compare Source](https://togithub.com/sindresorhus/np/compare/v6.3.2...v6.4.0) - Add `--test-script` flag to run custom tests before publish ([#​557](https://togithub.com/sindresorhus/np/issues/557)) [`0c46a2f`](https://togithub.com/sindresorhus/np/commit/0c46a2f) - Add support for `--no-2fa` flag ([#​559](https://togithub.com/sindresorhus/np/issues/559)) [`0638d27`](https://togithub.com/sindresorhus/np/commit/0638d27) - Add support for specifying release branch ([#​558](https://togithub.com/sindresorhus/np/issues/558)) [`b8b1976`](https://togithub.com/sindresorhus/np/commit/b8b1976)

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[coveralls]

Coverage remained the same at 100.0% when pulling 94ee3d935baa97165f2ba5541b955b95f95cd079 on renovate/np-6.x into 7cb6c347ad71708e732fa7de8aec5309053a4a03 on master.

[codecov-commenter]

Codecov Report

Merging #37 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #37   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          102       102           
=========================================
  Hits           102       102           

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