title: Change the color of an specific point in plotly
body: <p>I am trying to change the color of a specific point in a line graph in plotly. 
  I found out that you can change the color of a trace with this code snippet:</p>
  
  <pre><code>var update = {
  marker: {
      color: 'orange',
      size: 10
      }
  };
  
  Plotly.restyle('myDiv', update);
  </code></pre>
  
  <p>I also found out that it is possible to change the color of the first Point with:</p>
  
  <pre><code>Plotly.restyle('myDiv', 'marker.color', [['red']]);
  </code></pre>
  
  <p>But I don't understand how I am able to change the color of a specific point if I only know his x,y coordinates.</p>
  
  <p><a href="http://codepen.io/plotly/pen/xwmJvL" rel="noreferrer">Link</a> to a Codepen</p>