title: how can i add query in react router
body: <p>this is now</p>
  <p><code>http://localhost:8001/components/button/</code></p>
  <p>I want to</p>
  <p><code>http://localhost:8001/components/button/?theme=dark</code></p>
  <p>I used</p>
  <pre><code>browserHistory.push({
    pathname: '',
    query: {theme: dark},
  })
  
  and
  
  browserHistory.push({
    pathname: 'components/button',
    query: {theme: dark},
  })
  
  and 
  
  browserHistory.push({
    pathname: 'button',
    query: {theme: dark},
  })
  </code></pre>
  <p><strong>All failed.</strong></p>
  <p>How can i do? Can you help me, thank you!</p>