message: Fix docs for usage as a React component.
diff: @@ -152,10 +152,13 @@ Including stylesheet and the component (`2., 3.`)
  ```js
  import React from 'react'
  import ReactDOM from 'react-dom'
  -import Playground from 'graphql-playground-react'
  +import { Provider } from 'react-redux'
  +import { Playground, store } from 'graphql-playground-react'
  ReactDOM.render(
  - <Playground endpoint="https://api.graph.cool/simple/v1/swapi" />,
  + <Provider store={store}>
  + <Playground endpoint="https://api.graph.cool/simple/v1/swapi" />
  + </Provider>,
  document.body,
  )
  ```
  