title: How to round and stack bars using chart js?
body: <pre><code>scales: {
      x: {
          type : 'time',
          time : {
              round : 'minute',
              unit : 'minute'
          },
      },
      y: {
          stacked: true,
          beginAtZero: true,
      }
  }
  </code></pre>
  <p>I want to round off the x values to the closet minute and want the coinciding bars to be stacked. I tried this code but fails to stack the bars</p>