message: spread FlexContainer into CircleOcticon; don't call withSystemProps()
diff: import React from 'react'
  +import PropTypes from 'prop-types'
  import Octicon from '@githubprimer/octicons-react'
  import FlexContainer from './FlexContainer'
  -import {withSystemProps} from './system-props'
  function CircleOcticon(props) {
  const {size} = props
  const {icon, ...rest} = props
  return (
  <FlexContainer {...rest} size={size} alignItems="center" justifyContent="center">
  - <Octicon icon={icon} />
  + <Octicon icon={icon} size={size} />
  </FlexContainer>
  )
  }
  CircleOcticon.defaultProps = {
  - size: 32
  + ...FlexContainer.defaultProps,
  + size: 32,
  + borderRadius: '50%'
  }
  CircleOcticon.propTypes = {
  - icon: Octicon.propTypes.icon
  + ...FlexContainer.propTypes,
  + icon: Octicon.propTypes.icon,
  + size: PropTypes.number
  }
  -export default withSystemProps(CircleOcticon, ['space'])
  +export default CircleOcticon
  