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

@@           Coverage Diff           @@
##           master      #55   +/-   ##
=======================================
  Coverage   97.29%   97.29%           
=======================================
  Files          11       11           
  Lines          37       37           
=======================================
  Hits           36       36           
  Misses          1        1           

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[coveralls]

Coverage remained the same at 97.297% when pulling d7ae4db on renovate/np-6.x into 209f1e5 on master.