constructor(draggable) {
    super(draggable);

    /**
     * SortAnimation options
     * @property {Object} options
     * @property {Number} defaultOptions.duration
     * @property {String} defaultOptions.easingFunction
     * @type {Object}
     */
    this.options = {
      ...defaultOptions,
      ...this.getOptions(),
    };

    /**
     * Last animation frame
     * @property {Number} lastAnimationFrame
     * @type {Number}
     */
    this.lastAnimationFrame = null;
    this.lastElements = [];

    this[onSortableSorted] = this[onSortableSorted].bind(this);
    this[onSortableSort] = this[onSortableSort].bind(this);
  }
SortAnimation constructor.
@constructs SortAnimation
@param {Draggable} draggable - Draggable instance