export MyApp without wrapper.withRedux(MyApp) in ReduxToolkit usage

[PavelChugreev]

Hi there!
First of all, thanks a lot for this package, I found it really usefull.

I just ask you to add notice to documentation (https://github.com/kirill-konshin/next-redux-wrapper#redux-toolkit)
about the way of export MyApp.
I had been spending a lot of debugging hours, before I realized that I had not to use

export default wrapper.withRedux(MyApp)

with ReduxToolkit package.
https://github.com/kirill-konshin/next-redux-wrapper/blob/master/packages/demo-redux-toolkit/pages/_app.tsx#L39
comparing with vanila Redux or Redux-Sagas
https://github.com/kirill-konshin/next-redux-wrapper/blob/master/packages/demo-page/src/pages/_app.tsx#L7

It affects me during updating server store in Component.getInitialProps method.
I was not able to get actual values

Hope, it will be even more useful for developers who will face the same problem

[kirill-konshin]

wrapper.withRedux is a legacy implementation, that's still available for backward compatibility, which is described in the doc: https://github.com/kirill-konshin/next-redux-wrapper#wrapperusewrappedstore

Instead of wrapper.useWrappedStore you can also use legacy HOC, that can work with class-based components.