message: add FIXME note about Octicon sizing
diff: @@ -18,6 +18,9 @@ const CircleOcticon = ({size, bg, color, ...rest}) => {
  CircleOcticon.propTypes = {
  ...Octicon.propTypes,
  + // FIXME: we should be able to infer the size from the
  + // rendered Octicon so that we can support
  + // size={'small|medium|large'}
  size: PropTypes.number
  }
  