message: give Link both COMMON and TYPOGRAPHY system props
diff: @@ -2,7 +2,7 @@ import React from 'react'
  import PropTypes from 'prop-types'
  import styled from 'react-emotion'
  import {themeGet} from 'styled-system'
  -import {withSystemProps, COMMON} from './system-props'
  +import {withSystemProps, TYPOGRAPHY} from './system-props'
  import {colors} from './theme'
  const styledLink = styled('a')`
  @@ -21,4 +21,4 @@ function textDecoration({underline}) {
  export default withSystemProps({
  is: styledLink,
  color: 'blue.4'
  -}, COMMON)
  +}, TYPOGRAPHY)
  