message: add m + p utils to Flash
diff: import React from 'react'
  import PropTypes from 'prop-types'
  import classnames from 'classnames'
  +import {mapWhitespaceProps} from './props'
  const schemeMap = {
  green: 'success',
  @@ -8,7 +9,8 @@ const schemeMap = {
  yellow: 'warn'
  }
  -export default function Flash({children, className, full, scheme}) {
  +export default function Flash(props) {
  + const {children, className, full, scheme} = mapWhitespaceProps(props)
  return (
  <div className={classnames(className, 'flash', full && 'flash-full', scheme && `flash-${schemeMap[scheme]}`)}>
  {children}
  