message: add Avatar examples
diff: @@ -5,7 +5,7 @@ import {
  Detail
  } from '@compositor/kit'
  import {
  - Page,
  + Avatar,
  Box,
  Button,
  ButtonDanger,
  @@ -13,12 +13,13 @@ import {
  ButtonOutline,
  ButtonLink,
  CounterLabel,
  + Flash,
  Heading,
  Label,
  Link,
  - Text,
  - Flash,
  + Page,
  StateLabel,
  + Text,
  theme
  } from '../src'
  import Octicon from '@github/octicons-react'
  @@ -46,6 +47,20 @@ const Index = props => (
  ))}
  </Detail>
  </Example>
  + <Example name='Avatar'>
  + <Box mb={2}>
  + <Avatar username='primer' size={128} />
  + </Box>
  + <Box mb={2}>
  + <Avatar username='github' size={64} />
  + </Box>
  + <Box mb={2}>
  + <div className='avatar-parent-child float-left'>
  + <Avatar username='github' size={48} />
  + <Avatar username='primer' size={20} isChild />
  + </div>
  + </Box>
  + </Example>
  <Example name='Label'>
  <Box mb={3}>
  <Label>Default label</Label>
  