title: Name webpack chunks from react-loadable
body: <p>I've successfully added react-loadable library in my project to enable code splitting, the only problem I've found is that the chunks generated by webpack are not named, they are given integer names.</p>
  
  <p>My code for react-loadable use is</p>
  
  <pre class="lang-js prettyprint-override"><code>const AppRootLoadable = Loadable({
    loader: () =&gt; import(/* webpackChunkName: "app" */ './App'),
    loading: () =&gt; null,
    render(loaded) {
      const Component = loaded.default;
      return &lt;Component /&gt;;
    },
  });
  </code></pre>
  
  <p>I've added the comment to tell webpack 3 that I want this chunk to be named app. Have I done something wrong?</p>