public function whenCommitteeNameChanged(CommitteeNameChanged $event)
 {
     $committee = $this->committees->find((string) $event->committeeId());
     $committee = $committee->changeName($event->name());
     $this->committees->save($committee);
 }
 protected function applyCommitteeNameChanged(CommitteeNameChanged $event)
 {
     $this->name = $event->name();
 }