message: make BigNumber PureComponent
diff: @@ -67,7 +67,7 @@ const defaultProps = {
  renderTooltip: renderTooltipFactory(identity),
  };
  -class BigNumberVis extends React.Component {
  +class BigNumberVis extends React.PureComponent {
  constructor(props) {
  super(props);
  this.gradientId = shortid.generate();
  