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Merge pull request #522 from ckeditor/t/521

### Suggested merge commit message ([convention](https://github.com/ckeditor/ckeditor5-design/wiki/Git-commit-message-convention))

Other: Updated `ecmaVersion` from `es6` to `es2018` (`es9`). Changed the `space-before-function-paren` rule to preserve spaces before async arrow functions. Closes #521.

BREAKING CHANGE: The space before the parenthesis will be required by linter.

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