message: fix util props
diff: import React from 'react'
  import PropTypes from 'prop-types'
  import styled from 'react-emotion'
  -import {themeGet, space} from 'styled-system'
  +import {themeGet} from 'styled-system'
  import Avatar from './Avatar'
  import {withSystemProps} from './system-props'
  @@ -28,13 +28,13 @@ const childStyles = props => ({
  const ChildAvatar = styled(Avatar)`
  ${childStyles}
  `
  -const AvatarPair = ({children}) => {
  +const AvatarPair = ({children, ...rest}) => {
  const avatars = React.Children.map(children, (child, i) => {
  return i === 0
  ? React.cloneElement(child, {size: 40})
  : <ChildAvatar {...child.props} size={20}/>
  })
  - return <Wrapper>{avatars}</Wrapper>
  + return <Wrapper {...rest}>{avatars}</Wrapper>
  }
  // styled() changes this
  @@ -45,4 +45,4 @@ AvatarPair.propTypes = {
  ...Avatar.propTypes
  }
  -export default withSystemProps(AvatarPair, ['space'])
  +export default withSystemProps(AvatarPair)
  