message: update Link component to use classnames
diff: -import styled from 'styled-components'
  -import {
  - space,
  - color,
  - fontSize,
  - fontWeight
  -} from 'styled-system'
  +import React from 'react'
  +import classnames from 'classnames'
  -const Link = styled.a`
  - text-decoration: none;
  - display: inline-block;
  - &:hover { text-decoration: underline; }
  - ${space}
  - ${color}
  - ${fontSize}
  - ${fontWeight}
  -`
  -
  -Link.defaultProps = {
  - color: 'blue.5',
  +const Link = props => (
  + <a
  + {...props}
  + className={classnames(
  + props.className,
  + 'text-blue', {
  + 'muted-link': props.muted,
  + 'link-gray': props.gray,
  + 'link-gray-dark': props.graydark,
  + 'no-underline': props.nounderline,
  }
  + )}
  + />
  +)
  export default Link
  