README example code imports connected App instead of plain component

Readme for 04-add-state-management. When connecting the App component and updating tests:

> Now let's change our src/components/App/index.spec.js file to import our component App, as well as our various functions, instead of the container App:

> ```import App from '.'```

If I'm understanding right this should be: 

```import { App } from '.'```