message: use withSystemProps() (again, post-merge)
diff: @@ -3,7 +3,7 @@ import PropTypes from 'prop-types'
  import {arc as Arc, pie as Pie} from 'd3-shape'
  import DonutSlice from './DonutSlice'
  import {oneOrMoreOf} from './props'
  -import system from './system-props'
  +import {withSystemProps} from './system-props'
  const DonutChart = props => {
  const {className, data, children = mapData(data), size} = props
  @@ -46,4 +46,4 @@ DonutChart.propTypes = {
  size: PropTypes.number
  }
  -export default system({is: DonutChart}, 'space')
  +export default withSystemProps(DonutChart, ['space'])
  