title: zeroLineColor and zeroLineWidth not working for the x-axis in Chartjs
body: <p>How to change the width and the color of the x-axis (horizontal axis) in Chartjs? It seems to work using <code>zeroLineColor</code> and <code>zeroLineWidth</code> for the y-axis (vertical one), but it does not work for the x-axis.</p>
  <p>If we add:</p>
  <pre><code>ticks: {
    beginAtZero: true
  }
  </code></pre>
  <p>It works as expected, but I don't want the vertical ticks to start from 0.</p>
  <p>Is there a way to make this happen?</p>
  <pre><code>scales: {
          xAxes: [{
            gridLines: {
              zeroLineColor: 'black', // WORKS
              zeroLineWidth: 2 // WORKS
            },
            display: true
          }],
          yAxes: [{
            gridLines: {
              zeroLineColor: 'black', // DOES NOT WORK
              zeroLineWidth: 2, // DOES NOT WORK
            },
            id: 'y-axis-0',
            display: true,
            ticks: {
              // beginAtZero: true // This is what I dont't want to use
            }
          }]
        }
  </code></pre>
  <p>This is the result I get with the previous code:
  <a href="https://i.stack.imgur.com/wRitF.jpg" rel="nofollow noreferrer">Graphic</a></p>
  <p>As you can see, the x-axis is displayed without changes in color or width.</p>
  <p>I'm using version 2.9.4 of the Chartjs library.</p>