57.0.0

• Added: unicorn/no-fn-reference-in-iterator rule.
• Added: unicorn/import-index rule.
• Added: unicorn/new-for-builtins rule.
• Added: jest/prefer-to-have-length rule.
• Changed: disable no-unexpected-multiline rule.
• Changed: minimum require eslint-plugin-unicorn version is now ^3.0.0.