message: mark props as required
diff: @@ -13,8 +13,8 @@ export default class Menu extends React.Component {
  this.handleClosing = this.handleClosing.bind(this);
  }
  static propTypes = {
  - isOpen: PropTypes.bool,
  - requestClose: PropTypes.func
  + isOpen: PropTypes.bool.isRequired,
  + requestClose: PropTypes.func.isRequired
  };
  componentWillReceiveProps(nextProps) {
  if (this.state.isClosing && nextProps.isOpen) {
  