fix(deps): update dependency yargs to v15.4.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
yargs (source)	dependencies	minor	15.3.1 -> 15.4.1

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Release Notes

yargs/yargs

v15.4.1

Compare Source

v15.4.0

Compare Source

Features

• adds deprecation option for commands (027a636)
• support array of examples (#​1682) (225ab82)

Bug Fixes

• docs: describe usage of .check() in more detail (932cd11)
• i18n: Japanese translation phrasing (#​1619) (0894175)
• strict mode: report default command unknown arguments (#​1626) (69f29a9)
• usage: translate 'options' group only when displaying help (#​1600) (e60b39b)

Reverts

• Revert "chore(deps): update dependency eslint to v7 (#​1656)" (#​1673) (34949f8), closes #​1656 #​1673

15.3.1 (2020-03-16)

Bug Fixes

• __proto__ will now be replaced with ___proto___ in parse (#​258), patching a potential
  prototype pollution vulnerability. This was reported by the Snyk Security Research Team. (63810ca)

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[coveralls]

Coverage remained the same at 100.0% when pulling ed5b6ee on renovate/yargs-15.x into 6c652e2 on master.