Zephyr

Thanks to @shaundon for pushing this change in #67

• #60: Added WatchOS support thanks to @funkenstrahlen!

• #57 (thanks to @marcheimendinger): Fixed an issue for SwiftUI apps around synchronizing user defaults on the main thread.

• #55: Fixed a race condition that was accidentally overlooked when zephyrQueue was introduced. Huge thanks to @Tunous for pointing out the issue and submitting the fix.

This is a version bump that only affects folks using SPM. This change results in less metadata files being brought into an installation now that the architecture of this repo has changed.