message: fix import, add Page.propTypes
diff: import React from 'react'
  +import PropTypes from 'prop-types'
  import {NavLink} from 'react-router-dom'
  -import default as CSSStyles from './doc-components/CSS'
  +import {default as CSSStyles} from './doc-components/CSS'
  const Page = ({render}) => (
  <React.Fragment>
  @@ -24,4 +25,8 @@ const Page = ({render}) => (
  </React.Fragment>
  )
  +Page.propTypes = {
  + render: PropTypes.func
  +}
  +
  export default Page
  