reactjs - React Router v4 not displaying components

Question

The component is not been displayed when I navigate to localhost:3000/signup Is it because react router is updated to v4 and they way you route in react has now changed?

I have my main.js file

import Signup from '../imports/ui/Signup';

import
const routes = (
  <Router history={browserHistory}>
    <Route path="/signup" component={Signup}/>
  </Router>
);

Signup component

import React from 'react';

export default class Signup extends React.Component {
  render() {
    return <p>Signup</p>
  }
}

I'm using react router v4, also using Meteor.