Enhancements
- Merge latest updates from https://github.com/ThreeTen/threetenbp
- Update TZDB to 2021a
- Add Duration.toPartXxx methods
- Remove asynch TZDB loading, because it doulbe transfered data and complicate the logic
Bugfixes
- Fix #7
Notes
- GWT 2.9.0 compatible release. This release is the same as https://github.com/foal/gwt-time/releases/tag/v1.4.17