fix(docs): Change the return type of format function (docs & types) (p…

…rettier#751)

The return type was not updated when format function was changed to
an async function. This patch changes the type from `string` to
`Promise<string>`, this only affects language servers.

chore(prettier): Take Prettier 2.4.0's jsxBracketSameLine → bracketSa…

…meLine (prettier#749)

BREAKING CHANGE: Support Prettier 2.4.0+

feat: ✨ Add TypeScript definitions (prettier#739)

fix: 🐛 Support 'overrideConfigFile' option for ESLint (prettier#745)

fix: 🚑 Fix invalid ESLint configuration error (prettier#735)

fix: 🚑 Fix missing `await` (prettier#725)

Merge branch 'master' of github.com:prettier/prettier-eslint

ci: Upgrade to GitHub-native Dependabot (prettier#543)

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

BREAKING CHANGE: From previous commit that Kyle forgot to mark... We now require a minimum Node version of 10 (previously 8).

build(deps): Upgrade eslint to v7

### dependencies
* "eslint": "^7.9.0"
* "eslint-config-kentcdodds": "~16.0.1"

BREAKING CHANGE: eslint 7+ is now required and NO LONGER SUPPORTING NODE 8

build(deps): upgrade to prettier v2 (prettier#334)

BREAKING CHANGE: prettier 2 is now required