message: add fontSize prop to Block
diff: @@ -2,10 +2,10 @@ import React from 'react'
  import PropTypes from 'prop-types'
  import classnames from 'classnames'
  import {composeWithPropTypes, oneOrMoreOf, stylizer} from './props'
  -import {bg, borderColor, borderRadius, color, display, position, spacing} from './mappers'
  +import {bg, borderColor, borderRadius, color, display, fontSize, position, spacing} from './mappers'
  const stylize = stylizer(['width', 'minWidth', 'maxWidth', 'height', 'minHeight', 'maxHeight'])
  -const mapProps = composeWithPropTypes(bg, borderColor, borderRadius, color, display, position, spacing, stylize)
  +const mapProps = composeWithPropTypes(bg, borderColor, borderRadius, color, display, fontSize, position, spacing, stylize)
  function unique(values) {
  return values.filter((v, i) => values.indexOf(v) === i)
  