chore: release 15.0.0

[release-please]

🤖 I have created a release *beep* *boop*

15.0.0 (2019-11-10)

⚠ BREAKING CHANGES

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