title: Show X axis on top and bottom in line chart rendered with Chart.js 2.4.0
body: <p>I have a line chart rendered with Chart.js and I display the X axis at the bottom:</p>
  
  <pre><code>xAxes: [{  type: 'linear',
             position: 'bottom',
  </code></pre>
  
  <p>I would like to have two X axis, one at the bottom and one at the top.
  I see in the documentation that <code>position</code> is a string, thus one value only.</p>
  
  <p>Is it possible to accomplish this?</p>