title: react-router-dom with multiple query strings does not work
body: <p>I am new to react router. I use react-router-dom 4.2.2 
  in my router set up I have:</p>
  
  <pre><code>&lt;Route path={"/confirmuser/:confirmation_code/:username"} component={ConfirmUser} /&gt;
  </code></pre>
  
  <p>and here is a sample url I am trying to achieve:</p>
  
  <pre><code>localhost:3003/confirmuser?confirmation_code=986797&amp;username=5f1
  </code></pre>
  
  <p>As you see I am trying to send multiple query strings.
  in the confirmUser I read the query strings as follow:</p>
  
  <pre><code>    console.log(this.props.match.params.confirmation_code);
      console.log(this.props.match.params.username);
  </code></pre>
  
  <p>However I do not even get directed to this component and it seems react is not able to route to that page properly.
  Any idea?</p>