title: How can I add a title to c3.js chart
body: <p>Can any one suggest me the way of adding title to the C3.js line and bar charts ? I have got the following sample but it is for gauge chart. For any c3 chart is there any option to set the chart title? </p>
  
  <pre><code>donut: {
    title: 'Title'
  }
  </code></pre>