Update yargs to the latest version 🚀

[greenkeeper]

The devDependency yargs was updated from 12.0.1 to 15.2.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Publisher: oss-bot
License: MIT

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[coveralls]

Coverage remained the same at 99.73% when pulling 8a267b7 on greenkeeper/yargs-15.2.0 into 5c7d67f on master.

[greenkeeper]

• The devDependency yargs was updated from 12.0.1 to 15.3.0.

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Release Notes for yargs v15.3.0

Features

• yargs-parser: introduce single-digit boolean aliases (#1576) (3af7f04)
• add usage for single-digit boolean aliases (#1580) (6014e39)

Bug Fixes

• address ambiguity between nargs of 1 and requiresArg (#1572) (a5edc32)

[greenkeeper]

• The devDependency yargs was updated from 12.0.1 to 15.3.1.

Update to this version instead 🚀