v3.0.0

Breaking

• Require Xcode 11 and Swift 5.1 for building 90ac6f8
• Switch from defaults to Defaults 90ac6f8
  Example: defaults[.unicorn] → Defaults[.unicorn]
  Example: defaults.observable → Defaults.observable
• Rename defaults.clear to Defaults.removeAll and make it a static method 27c9997

Enhancements

• Add .reset() method to reset the given keys back to their default value d1e4215