update method
Implementation
@override
Future<AppSettings> update(SettingsUpdater updater) async {
final current = await load();
final updated = updater(current);
await save(updated);
return updated;
}
@override
Future<AppSettings> update(SettingsUpdater updater) async {
final current = await load();
final updated = updater(current);
await save(updated);
return updated;
}