message: Add prop  to Avatar
diff: @@ -5,9 +5,9 @@ import {space} from 'styled-system'
  import systemPropTypes from '@styled-system/prop-types'
  import theme from './theme'
  -function borderRadius({size}) {
  +function borderRadius({size, form}) {
  return {
  - borderRadius: size <= 24 ? '2px' : '3px'
  + borderRadius: form === 'round' ? '50%' : (size <= 24 ? '2px' : '3px')
  }
  }
  @@ -27,7 +27,8 @@ const Avatar = styled.img.attrs(props => ({
  Avatar.defaultProps = {
  theme,
  size: 20,
  - alt: ''
  + alt: '',
  + form: 'square'
  }
  Avatar.propTypes = {
  @@ -35,7 +36,8 @@ Avatar.propTypes = {
  size: PropTypes.number,
  src: PropTypes.string,
  ...systemPropTypes.space,
  - theme: PropTypes.object
  + theme: PropTypes.object,
  + form: PropTypes.PropTypes.oneOf(['square', 'round'])
  }
  export default Avatar
  