title: ng2-chart tooltip position change option?
body: <p>I am trying to build a Doughnut Chart using ng2-chart Angular2 directives for Chart.js. This chart.js has default option for tooltip positioning, I want to make tooltip to show outside the chart. Is there a way to make it possible?</p>
  
  <pre><code>public doughnutChartOptions = {
   responsive: true,
    tooltips:{
     mode: 'nearest',
    }
  }
  </code></pre>
  
  <p>I expect something like tooltip to be displayed outside the chart, Instead of showing inside the chart; top, bottom and to sides.</p>