message: add more DonutChart propTypes
diff: @@ -67,7 +67,9 @@ const DonutSlice = ({children, d, fill}) => {
  }
  DonutChart.propTypes = {
  - children: PropTypes.arrayOf(DonutSlice)
  + children: PropTypes.arrayOf(DonutSlice),
  + data: PropTypes.objectOf(PropTypes.number),
  + size: PropTypes.number
  }
  DonutSlice.propTypes = {
  