Update dependency yargs to v15

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
yargs (source)	dependencies	major	^14.0.0 -> ^15.0.0
yargs (source)	devDependencies	major	^14.0.0 -> ^15.0.0

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Release Notes

yargs/yargs

v15.0.1

Compare Source

v15.0.0

Compare Source

⚠ BREAKING CHANGES

• deps: yargs-parser now throws on invalid combinations of config (#​1470)
• yargs-parser@16.0.0 drops support for Node 6
• drop Node 6 support (#​1461)
• remove package.json-based parserConfiguration (#​1460)

Features

• deps: yargs-parser now throws on invalid combinations of config (#​1470) (c10c38c)
• expose Parser from require('yargs/yargs') (#​1477) (1840ba2)

Bug Fixes

• docs: TypeScript import to prevent a future major release warning (#​1441) (b1b156a)
• stop-parse was not being respected by commands (#​1459) (12c82e6)
• update to yargs-parser with fix for array default values (#​1463) (ebee59d)
• docs: update boolean description and examples in docs (#​1474) (afd5b48)

Miscellaneous Chores

• drop Node 6 support (#​1461) (2ba8ce0)

Code Refactoring

• remove package.json-based parserConfiguration (#​1460) (0d3642b)

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