fix(deps): update dependency yargs to v15.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
yargs (source)	dependencies	minor	15.0.2 -> 15.1.0

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Release Notes

yargs/yargs

v15.1.0

Compare Source

Features

• lang: add Finnish localization (language code fi) (222c8fe)
• complete short options with a single dash (#​1507) (99011ab)
• onFinishCommand handler (#​1473) (fe380cd)

Bug Fixes

• getCompletion() was not working for options (#​1495) (463feb2)
• misspelling of package.json engines field (0891d0e)
• populate positionals when unknown-options-as-args is set (#​1508) (bb0f2eb), closes #​1444
• show 2 dashes on help for single digit option key or alias (#​1493) (63b3dd3)
• docs: use recommended cjs import syntax for ts examples (#​1513) (f9a18bf)

15.0.2 (2019-11-19)

Bug Fixes

• temporary fix for libraries that call Object.freeze() (#​1483) (99c2dc8)

15.0.1 (2019-11-16)

Bug Fixes

• deps: cliui, find-up, and string-width, all drop Node 6 support (#​1479) (6a9ebe2)

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