title: What is the use of scroll behavior mentioned in react-router?
body: <p>I was trying to upgrade to latest react-router. While reading the upgrade guide I found this "<code>Using Scroll Behavior</code>" and Below code snippet </p>
  
  <pre><code>import { Router, useRouterHistory } from 'react-router'
  import createBrowserHistory from 'history/lib/createBrowserHistory';
  import useScroll from 'scroll-behavior/lib/useStandardScroll';
  
  const appHistory = useScroll(useRouterHistory(createBrowserHistory))();
  &lt;Router history={appHistory}/&gt;
  </code></pre>
  
  <p>What is the use of scroll behaviour in react-router? I didn't see its much reference in docs. Any hint will be helpful. </p>