title: pan on chart.js also zoom on line charts
body: <p>I want to pan and zoom on a line chart with chartjs-plugin-zoom. The problem is that when I use pan it also zoom on chart till just one label remains, there is no problem when chart model is bar. how can I solve this problem? I want pan just to pan not zoom.
  this is a fiddle that works for bar chart but not works correctly for line chart:
       <a href="https://jsfiddle.net/pfd2on55/" rel="nofollow noreferrer">https://jsfiddle.net/pfd2on55/</a></p>
  
  <pre><code>var ctx = document.getElementById("canvas").getContext('2d');
  var myChart = new Chart(ctx, {
  type: 'line',
  data: {
    labels: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sept'],
    datasets: [{
       label: '# of Votes',
       data: [12, 19, 3, 5, 2, 5, 9, 4, 11]
    }]
  },
  options: {
    pan: {
       enabled: true,
       mode: 'x',
    },
    zoom: {
       enabled: true,
       mode: 'x',
     }
     }
    });
  </code></pre>