Update dependency eslint-config-prettier to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
eslint-config-prettier	7.2.0 -> 8.5.0

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Release Notes

prettier/eslint-config-prettier

v8.5.0

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• Added: [@​typescript-eslint/space-before-blocks]. Thanks to Masafumi Koba (@​ybiquitous)!

v8.4.0

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• Added: [vue/quote-props]. Thanks to @​xcatliu!

v8.3.0

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• Added: Support for [@​babel/eslint-plugin]. Thanks to Chip Zhang (@​ChipZhang) for the heads-up! ([eslint-plugin-babel] is still supported, too.)

v8.2.0

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• Added: [flowtype/quotes]. Thanks to Martin Zlámal (@​mrtnzlml)!

v8.1.0

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• Added: [flowtype/object-type-curly-spacing].
• Added: Dummy files for the configs removed in 8.0.0. The dummy files throw an error that try to guide you how to upgrade.

v8.0.0

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• Changed: All configs have been merged into one!

  To upgrade, change:

  {
    "extends": [
      "some-other-config-you-use",
      "prettier",
      "prettier/@​typescript-eslint",
      "prettier/babel",
      "prettier/flowtype",
      "prettier/react",
      "prettier/standard",
      "prettier/unicorn",
      "prettier/vue"
    ]
  }

  Into:

  {
    "extends": [
      "some-other-config-you-use",
      "prettier"
    ]
  }

  The "prettier" config now includes not just ESLint core rules, but also rules from all plugins. Much simpler!

  So … what’s the catch? Why haven’t we done this earlier? Turns out it’s just a sad mistake. I (@​lydell) was confused when testing, and thought that turning off unknown rules in a config was an error. Thanks to Georgii Dolzhykov (@​thorn0) for pointing this out!

  If you use [eslint-plugin-prettier], all you need is [plugin:prettier/recommended]:

  {
    "extends": [
      "some-other-config-you-use",
      "plugin:prettier/recommended"
    ]
  }

  (The ["prettier/prettier" config][prettier-prettier-config] still exists separately. It’s the odd one out. The main "prettier" config does not include the rules from it.)

• Changed: The CLI helper tool now only prints warnings for [arrow-body-style] and [prefer-arrow-callback], just like other “special rules.” This means that if you’ve decided to use those rules and [eslint-plugin-prettier] at the same time, you’ll get warnings but exit code zero (success).

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