`SwitchWithSlide` example - update

SwitchWithSlide-update.js

componentDidUpdate(prevProps, prevState) {
  const prevUniqId = prevProps.uniqKey || prevProps.children.type;
  const uniqId = this.props.uniqKey || this.props.children.type;

  if (prevUniqId !== uniqId) {
    this.setState({
      childPosition: Slider.TO_LEFT,
      curChild: this.props.children,
      curUniqId: uniqId,
      prevChild: prevProps.children,
      prevUniqId,
      animationCallback: this.swapChildren
    });
  }
}