fix(deps): update dependency package-json to v6

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change	References
package-json	dependencies	major	^5.0.0 -> ^6.0.0	source

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Release Notes

sindresorhus/package-json

v6.3.0

Compare Source

• Refactor TypeScript definition to CommonJS compatible export (#​52) 2e8a263

v6.2.0

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• Add agent option (for proxy support) (#​51) f24e955

v6.1.0

Compare Source

• Add TypeScript definition (#​49) 960ccd6
• Add registryUrl option (#​46) 53c40f2
• Use keepAlive agent to increase performance for multiple calls (#​50) 1eed2f8

v6.0.0

Compare Source

Breaking:

• Require Node.js 8 and update dependencies 7f4ab52

Other:

• Throw specific errors 685fef2

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[codecov-io]

Codecov Report

Merging #79 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #79   +/-   ##
=======================================
  Coverage   78.57%   78.57%           
=======================================
  Files           4        4           
  Lines         266      266           
  Branches       41       41           
=======================================
  Hits          209      209           
  Misses         57       57

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