message: Button size='small' -> size='sm' (derp)
diff: @@ -115,7 +115,7 @@ const Index = props => (
  <Button> Button </Button>
  </Block>
  <Block mb={2}>
  - <Button size='small'> Button small </Button>
  + <Button size='sm'> Button small </Button>
  </Block>
  <Block mb={2}>
  <Button size='large'> Button large </Button>
  