Add prettier

[VincentLanglet]

I made some try to find the rules already use for this project:

• singleQuote over doubleQuote
• arrowParens always
• trailingComma

[VincentLanglet]

@rumpl Funny,

I got

Unused devDependencies
* eslint-config-prettier

But i use it, see https://github.com/prettier/eslint-plugin-prettier#recommended-configuration

plugin:prettier/recommended is enough.

[rumpl]

Damn... I guess we will need a special case for this prettier plugin...

[rumpl]

Just opened a PR #464

[codecov]

Codecov Report

Merging #463 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #463      +/-   ##
==========================================
+ Coverage   99.17%   99.18%   +<.01%     
==========================================
  Files          38       38              
  Lines         731      737       +6     
==========================================
+ Hits          725      731       +6     
  Misses          6        6

Impacted Files	Coverage Δ
src/parser/jsx.js	100% <ø> (ø)	⬆️
src/special/mocha.js	100% <ø> (ø)	⬆️
src/parser/vue.js	75% <ø> (ø)	⬆️
src/constants.js	100% <ø> (ø)	⬆️
src/cli.js	100% <100%> (ø)	⬆️
src/special/husky.js	100% <100%> (ø)	⬆️
src/detector/typescriptImportEqualsDeclaration.js	100% <100%> (ø)	⬆️
src/special/gatsby.js	100% <100%> (ø)	⬆️
src/detector/requireCallExpression.js	100% <100%> (ø)	⬆️
src/special/eslint.js	100% <100%> (ø)	⬆️
... and 19 more

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[rumpl]

Awesome thanks @VincentLanglet