fix immutable reducer import

Author: Bernabe Gonzalez

README.md

@@ -151,12 +151,12 @@ Deletes the current user from the storage/cookies
 
 ## Immutable JS
 Usage of `redux-react-session` with an immutable store is really simple.
-Instead of the `sessionReducer` import the `sessionImmutableReducer`, as the following example:
+Instead of the `sessionReducer` import the `sessionReducer` from `redux-react-session/immutable`, as the following example:
 
 - Add the session reducer:
 ```javascript
 import { combineReducers } from 'redux';
-import { sessionImmutableReducer as session } from 'redux-react-session';
+import { sessionReducer as session } from 'redux-react-session/immutable';
 
 const reducers = {
   // ... your other reducers here ...

immutable.js

@@ -0,0 +1,3 @@
+const immutableReducer = require('./dist/immutableReducer');
+
+export const sessionReducer = immutableReducer.default;

src/index.js

@@ -9,7 +9,6 @@ import {
   invalidSession
 } from './actions';
 import reducer from './reducer';
-import immutableReducer from './immutableReducer';
 
 let instance;
 
@@ -261,4 +260,3 @@ export class sessionService {
 }
 
 export const sessionReducer = reducer;
-export const sessionImmutableReducer = immutableReducer;