message: Fixes prop-type
diff: @@ -19,7 +19,7 @@ class CollaboratorInviteButton extends Component {
  mutate: PropTypes.func.isRequired,
  onAdd: PropTypes.func.isRequired,
  email: PropTypes.string.isRequired,
  - channel_id: PropTypes.string.isRequired,
  + channel_id: PropTypes.number.isRequired,
  }
  state = {
  