title: Create a heatmap/punchcard Using Chart.js
body: <p>I have multiple charts on page, one of them is HeatMap.
  I am using <a href="http://www.chartjs.org/" rel="nofollow noreferrer">chartjs</a> to create  my charts. I am unable to create a heatmap using chartjs. Also is it possible to get look like github punchcard with chartJS</p>
  
  <p><a href="https://i.stack.imgur.com/pRQuh.png" rel="nofollow noreferrer">punchcard example</a></p>