Update to eslint@6
once prettier-eslint has a new version (^9.0.0), update to eslint@6 to make @linguala/common-dev-dependencies updates work: https://github.com/prettier/prettier-eslint/pull/236#issuecomment-534417412
once prettier-eslint has a new version (^9.0.0), update to eslint@6 to make @linguala/common-dev-dependencies updates work: https://github.com/prettier/prettier-eslint/pull/236#issuecomment-534417412