message: don't implement display twice
diff: import styled from 'styled-components'
  import PropTypes from 'prop-types'
  +import {space, color} from 'styled-system'
  +import systemPropTypes from '@styled-system/prop-types'
  import {LAYOUT, COMMON} from './constants'
  import theme from './theme'
  const Box = styled.div`
  - ${LAYOUT} ${COMMON};
  + ${LAYOUT}
  + ${space}
  + ${color}
  `
  Box.defaultProps = {theme}
  Box.propTypes = {
  ...LAYOUT.propTypes,
  - ...COMMON.propTypes,
  + ...systemPropTypes.space,
  + ...systemPropTypes.color,
  theme: PropTypes.object
  }
  