title: chart.js-datalabels-plugins don't work
body: <p>I'm trying to use chartjs-datalabels-plugin to show values on the chart. but I can't make it work on <a href="https://jsfiddle.net/0u5scm3r/27/" rel="nofollow noreferrer">jsfiddle</a></p>
  
  <p>Here's my code </p>
  
  <pre><code>&lt;div class="graph"&gt;
    &lt;div class="chart-legend"&gt;
  
    &lt;/div&gt;
    &lt;div class="chart"&gt;
      &lt;canvas id="myChart" height = 60&gt;&lt;/canvas&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I import chartjs-datalabels-plugin in jsfiddle and then in options I enable the display option to true. but no value is shown in the chart.</p>
  
  <pre><code>var ctx = $('#myChart');
  
  ctx.height(100);
  var myChart = new Chart(ctx, {
      ....
      maintainAspectRatio: false,
      options: {
          plugins: {
              datalabels: {
                          color: 'black',
                          display: true,
                          font: {
                              weight: 'bold'
                          },
                          formatter: Math.round
                      }
          },
          legend: {
              display: false
          },
          maintainAspectRatio: false,
  
          scales: {
              yAxes: [{
                  stacked: true,
  
                  gridLines: {
                      display: false,
                      drawBorder: false,
  
                  },
                  ticks: {
                      beginAtZero: true,
                  },
                  barThickness: 9
  
              }],
              xAxes: [{
                  stacked: true,
  
                  gridLines: {
                      display: false,
                      drawBorder: false,
  
                  },
                  ticks: {
                      beginAtZero: true,
                      suggestedMax: 100,
                      display: false
  
                  },
                  barThickness: 9
  
              }]
          }
      }
  });
  </code></pre>