message: Add example of using mask as function to datepicker example
diff: @@ -32,7 +32,8 @@ export default class BasicUsage extends PureComponent {
  label="Masked input"
  format="DD/MM/YYYY"
  placeholder="10/10/2018"
  - mask={[/\d/, /\d/, '/', /\d/, /\d/, '/', /\d/, /\d/, /\d/, /\d/]}
  + // handle clearing outside => pass plain array if you are not controlling value outside
  + mask={value => (value ? [/\d/, /\d/, '/', /\d/, /\d/, '/', /\d/, /\d/, /\d/, /\d/] : [])}
  value={selectedDate}
  onChange={this.handleDateChange}
  animateYearScrolling={false}
  