title: Change label color in c3js (c3.js)
body: <p>I have a very simple c3js pie chart, but the white labels get lost inside the yellow slice of the pie (hast to be that color). Is there any way to change the color of just that label? Alternatively, is there a way to change the color of all labels?</p>
  
  <pre><code>      var chart = c3.generate({
      data: {
        columns: [
          ['PC', 25077394],
          ["Tablet", 3240595],
          ["Mobile", 6427981],
        ],
        type : 'pie'
      },
      legend: {
      position: 'bottom'
  
  },
      axis: {
        x: {
          label: 'Sepal.Width'
        },
        y: {
          label: 'Petal.Width'
        }
      },
    });
  
    setTimeout(function () {
      chart.data.colors({PC: '#2C9AB7',Tablet: '#FEBE12', Mobile: '#DB3A1B'});
    }, 1000);
  </code></pre>