message: export Details from src/index.js
diff: @@ -15,6 +15,8 @@ export { default as ButtonPrimary } from './ButtonPrimary'
  export { default as ButtonOutline } from './ButtonOutline'
  export { default as ButtonLink } from './ButtonLink'
  +export { default as Details } from './Details'
  +
  export { default as Heading } from './Heading'
  export { default as Label } from './Label'
  export { default as Link } from './Link'
  