message: use withSystemProps() in Label
diff: import React from 'react'
  import PropTypes from 'prop-types'
  import classnames from 'classnames'
  -import {space} from 'styled-system'
  -import styled from 'react-emotion'
  +import {withSystemProps} from './system-props'
  const colorScheme = (scheme, outline) => {
  if (outline) {
  @@ -19,7 +18,7 @@ const colorScheme = (scheme, outline) => {
  }
  }
  -const Label = styled(({className, outline, scheme, ...rest}) => {
  +function Label({className, outline, scheme, ...rest}) {
  const classes = classnames(
  className,
  'Label',
  @@ -27,12 +26,11 @@ const Label = styled(({className, outline, scheme, ...rest}) => {
  colorScheme(scheme, outline)
  )
  return <span className={classes} {...rest} />
  -})(space)
  +}
  Label.propTypes = {
  - ...space.propTypes,
  outline: PropTypes.bool,
  scheme: PropTypes.oneOf(['gray', 'gray-darker', 'green', 'orange'])
  }
  -export default Label
  +export default withSystemProps(Label, ['space'])
  