message: Change return type to void
diff: @@ -24,13 +24,12 @@ export class ItemsList {
  return this._selected[0];
  }
  - select(item: NgOption): boolean {
  + select(item: NgOption) {
  if (!this._multiple) {
  this.clearSelected();
  }
  this._selected.push(item);
  item.selected = true;
  - return true;
  }
  unSelect(item: NgOption) {
  