What is the alternative in react-redux-firebase with v3.0.0 to find out if auth is ready - to render for the first time? Problem in this case is that store doesn't contain firebaseAuthIsReady or am I missing something?

```
//ReactReduxFirebaseProvider v3.0.0
const rrfConfig = { 
  userProfile: 'users',
  attachAuthIsReady: true,
  firebaseStateName: 'firebase'
}

//const store = configureStore(initialState, history, rrfConfig);
const store = configureStore(initialState, history);

const rrfProps = {
  firebase,
  config: rrfConfig,
  dispatch: store.dispatch,
  createFirestoreInstance
}

const MOUNT_NODE = document.getElementById('root')
//store.firebaseAuthIsReady.then(() => {
  ReactDOM.render(
    <MuiThemeProvider theme={theme}>
      <Provider store={store}>
        <ReactReduxFirebaseProvider {...rrfProps}>
          <ConnectedRouter history={history}>
            <App />
          </ConnectedRouter>
        </ReactReduxFirebaseProvider>
      </Provider>
    </MuiThemeProvider>,
    MOUNT_NODE
  );

```