text: import React from 'react';
  import { Link } from 'react-router';
  import NavLink from './NavLink';
  
  export default class App extends React.Component {
      render() {
          return (
              <div>
                  <h1>Hello, React Router!</h1>
                  <ul role="nav">
                      <li><NavLink to="/about">About</NavLink></li>
                      <li><NavLink to="/repos">Repos</NavLink></li>
                      <li><NavLink to="/repos/reactjs/react-router">React Router</NavLink></li>
                      <li><NavLink to="/repos/facebook/react">React</NavLink></li>
                  </ul>
  
                  {this.props.children}
              </div>
          );
      }
  };
  