Method destroy

src/Droppable/Droppable.js:132–138

* Destroys Droppable instance.

()

   * Destroys Droppable instance.
   */
  destroy() {
    super.destroy();

    this.off('drag:start', this[onDragStart])
      .off('drag:move', this[onDragMove])
      .off('drag:stop', this[onDragStop]);
  }

  /**
   * Drag start handler