message: Fix sticky polyfill after moving it to StickySidebar component
diff: @@ -31,11 +31,11 @@ export class StickySidebar extends ComponentWithOptions<StickySidebarProps> {
  stickyElement: Element;
  componentDidMount() {
  - stickyfill.add(this.refs['sticky-children']);
  + stickyfill.add(this.stickyElement);
  }
  componentWillUnmount() {
  - stickyfill.remove(this.refs['sticky-children']);
  + stickyfill.remove(this.stickyElement);
  }
  get scrollYOffset() {
  