title: Why does create-react-app now use a function component for App?
body: <p>Used to be:</p>
  
  <pre><code>class App extends Components{
    //...
  }
  </code></pre>
  
  <p>Now <code>create-react-app</code> has this in <code>App.js</code>:</p>
  
  <pre><code>function App(){
    //...
  }
  </code></pre>
  
  <p>Anyone know why this change was made? Are they suggesting we shouldn't have state in App?</p>