message: popper placement
diff: @@ -17,7 +17,7 @@ export default class Popper extends Component {
  topGap: PropTypes.number,
  leftGap: PropTypes.number,
  zIndex: PropTypes.number,
  - placement: PropTypes.oneOf(['bottom', 'bottom-left', 'top', 'left', 'right'])
  + placement: PropTypes.oneOf(['bottom', 'bottom-start', 'top', 'left', 'right'])
  }
  static defaultProps = {
  @@ -25,7 +25,7 @@ export default class Popper extends Component {
  topGap: 2,
  leftGap: 0,
  zIndex: 1060,
  - placement: 'bottom-left'
  + placement: 'bottom-start'
  }
  componentDidUpdate () {
  @@ -58,7 +58,7 @@ export default class Popper extends Component {
  top = top + topGap + rect.height
  left = left + rect.width / 2
  break
  - case 'bottom-left':
  + case 'bottom-start':
  top = top + topGap + rect.height
  break
  