Bump parcel from 2.0.0-nightly.668 to 2.0.0-nightly.679 (#375)

Bumps [parcel](https://github.com/parcel-bundler/parcel) from 2.0.0-nightly.668 to 2.0.0-nightly.679.
- [Release notes](https://github.com/parcel-bundler/parcel/releases)
- [Changelog](https://github.com/parcel-bundler/parcel/blob/v2/CHANGELOG.md)
- [Commits](https://github.com/parcel-bundler/parcel/commits)

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