message: fix Year propTypes
diff: @@ -6,12 +6,12 @@ import classnames from 'classnames';
  class Year extends PureComponent {
  static propTypes = {
  - children: PropTypes.element.isRequired,
  + children: PropTypes.node.isRequired,
  classes: PropTypes.object.isRequired,
  disabled: PropTypes.bool,
  onSelect: PropTypes.func.isRequired,
  selected: PropTypes.bool,
  - year: PropTypes.string.isRequired,
  + year: PropTypes.number.isRequired,
  }
  static defaultProps = {
  