message: fix required TouchInit members
diff: @@ -1530,7 +1530,7 @@ interface TouchInit {
  clientX?: number;
  clientY?: number;
  force?: number;
  - identifier?: number;
  + identifier: number;
  pageX?: number;
  pageY?: number;
  radiusX?: number;
  @@ -1538,7 +1538,7 @@ interface TouchInit {
  rotationAngle?: number;
  screenX?: number;
  screenY?: number;
  - target?: EventTarget;
  + target: EventTarget;
  touchType?: TouchType;
  }
  