chore(deps): update dependency p-retry to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
p-retry	devDependencies	major	^3.0.0 -> ^4.0.0	source

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Release Notes

sindresorhus/p-retry

v4.0.0

Compare Source

Breaking:

• Require Node.js 8 0ed8d5d (#​21) 4b6ec19

Enhancements:

• Throw a useful error if a non-error is thrown a9d75a5
• Add TypeScript definition (#​21) 4b6ec19

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[codecov]

Codecov Report

Merging #223 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #223   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines           4      4           
=====================================
  Hits            4      4

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