App.js with routing

class App extends Component {
  render() {
    return (
      <ApolloProvider client={client}>
        <div className="App">
          <header className="App-header">
            <h1>
              <Link to="/">apollo-link-rest + JSONPlaceholder!</Link>
            </h1>
          </header>
          <div className="App-container">
            <Router>
              <AllUsers path="/" />
            </Router>
          </div>
        </div>
      </ApolloProvider>
    );
  }
}