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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[coveralls]

Coverage remained the same at 100.0% when pulling 53e12e1 on renovate/np-6.x into 3365db8 on master.

[codecov-commenter]

Codecov Report

Merging #39 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #39   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines           54        54           
=========================================
  Hits            54        54           

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