Update componentWillUpdate to componentDidUpdate

[fabdrol]

componentWillReceiveProps(nextProps) {
    if (!this.rfb) {
      return;
    }

    if (nextProps.scale !== this.props.scale) {
      this.rfb.get_display().set_scale(nextProps.scale || 1);
      this.get_mouse().set_scale(nextProps.scale || 1);
    }
  }

This method is deprecated by React Team.