chore: release 15.2.0

[release-please]

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

15.2.0 (2020-03-01)

⚠ BREAKING CHANGES

• deps: yargs-parser@17.0.0 no longer implicitly creates arrays out of boolean
  arguments when duplicates are provided

Features

• completion: takes negated flags into account when boolean-negation is set (#1509) (7293ad5)
• deps: pull in yargs-parser@17.0.0 (#1553) (b9409da)
• deprecateOption (#1559) (8aae333)
• display appropriate $0 for electron apps (#1536) (d0e4379)
• introduces strictCommands() subset of strict mode (#1540) (1d4cca3)
• deps: yargs-parser with 'greedy-array' configuration (#1569) (a03a320)

Bug Fixes

• help always displayed for the first command parsed having an async handler (#1535) (d585b30)
• deps: fix enumeration for normalized path arguments (#1567) (0b5b1b0)
• locales: only translate default option group name (acc16de)
• locales: remove extra space in French for 'default' (#1564) (ecfc2c4)
• translations: add French translation for unknown command (#1563) (18b0b75)
• translations: fix pluralization in error messages. (#1557) (94fa38c)
• yargs: correct support of bundled electron apps (#1554) (a0b61ac)

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