message: use renderFile() in BaseStyles injectGlobal
diff: @@ -3,10 +3,9 @@ import {injectGlobal} from 'emotion'
  import {withSystemProps, TYPOGRAPHY} from './system-props'
  injectGlobal(preval`
  - const render = require('../lib/render-sass.js')
  + const {renderFile} = require('../lib/render-sass.js')
  const path = require.resolve('./primer-components.scss')
  - const source = require('fs').readFileSync(path, 'utf8')
  - module.exports = render(source)
  + module.exports = renderFile(path)
  `)
  const BaseStyles = withSystemProps({
  