Update dependency np to v6.4.0

[renovate]

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

Compare Source

• Add --test-script flag to run custom tests before publish (#​557) 0c46a2f
• Add support for --no-2fa flag (#​559) 0638d27
• Add support for specifying release branch (#​558) b8b1976

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[codecov-commenter]

Codecov Report

Merging #123 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #123   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines          102       102           
=========================================
  Hits           102       102           

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[coveralls]

Pull Request Test Coverage Report for Build 546

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.633%

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Totals
Change from base Build 542:	0.0%
Covered Lines:	102
Relevant Lines:	102

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💛 - Coveralls