Update yargs to version 4.2.0 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

yargs just published its new version 4.2.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of yargs – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 133 commits .

• 28a628e bug fixes for commands
• 16abb16 a couple more small tweaks before a release
• 5c3aeb6 pass the require from the current context
• a9b1d02 update changelog, move to yargs/yargs repo
• 376ad0e add integration tests for = parsing
• 7d00fe6 refactor integration tests
• ad23cd7 Merge pull request #393 from nexdrew/implicit-command-usage
• 4f32150 Merge pull request #395 from novemberborn/retain-global-groups
• f7f9709 preserve groups containing global keys when resetting
• 0f9cfcc use implicit usage string when not set by command builder function
• e0d55f1 Merge pull request #392 from nexdrew/make-wrap-global
• fcdbda3 Merge pull request #391 from nexdrew/fix-command-module-listed-twice
• 3074e37 do not reset wrap for commands
• f38ebf4 check for module command before adding to usage
• 3808fab add option short-hand for numbers

There are 133 commits in total. See the full diff.

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