[#134] fix : Component To PureComponent

[SoYoung210]

PureComponent is much better than just Component in rendering performance

And, I think

 static propTypes = {
    className: PropTypes.string,
    max: PropTypes.number.isRequired,
    onChange: PropTypes.func.isRequired,
    value: PropTypes.number.isRequired
  }
  static defaultProps = {
    className: ""
  }

it's (little bit) better ..!