message: set default color to blue.4 and remove other color props
diff: @@ -5,12 +5,11 @@ import {themeGet} from 'styled-system'
  import {withSystemProps, COMMON} from './system-props'
  import {colors} from './theme'
  -const styledLink = styled(Link)`
  +const styledLink = styled('a')`
  ${textDecoration};
  &:hover {
  text-decoration: underline;
  }
  - ${color};
  `
  function textDecoration({underline}) {
  @@ -19,30 +18,7 @@ function textDecoration({underline}) {
  }
  }
  -function color({muted, scheme, ...rest}) {
  - return {
  - color:
  - scheme === 'gray-dark'
  - ? themeGet('colors.gray.9', colors.gray[9])(rest)
  - : muted || scheme === 'gray'
  - ? themeGet('colors.gray.6', colors.gray[6])(rest)
  - : themeGet('colors.blue.5', colors.blue[5])(rest)
  - }
  -}
  -
  -function Link({children, className, ...rest}) {
  - return (
  - <a className={className} {...rest}>
  - {children}
  - </a>
  - )
  -}
  -
  -Link.propTypes = {
  - href: PropTypes.string,
  - muted: PropTypes.bool,
  - underline: PropTypes.bool,
  - scheme: PropTypes.oneOf(['gray', 'gray-dark'])
  -}
  -
  -export default withSystemProps(styledLink, COMMON)
  +export default withSystemProps({
  + is: styledLink,
  + color: 'blue.4'
  +}, COMMON)
  