message: fix: use correct aria role
  closes
diff: @@ -63,7 +63,7 @@ export type CompareWithFn = (a: any, b: any) => boolean;
  encapsulation: ViewEncapsulation.None,
  changeDetection: ChangeDetectionStrategy.OnPush,
  host: {
  - 'role': 'dropdown',
  + 'role': 'listbox',
  'class': 'ng-select',
  '[class.ng-single]': '!multiple',
  }
  