title: redux-presist not updating local storage
body: <p>I have a basket reducer which contains my shopping basket and basket content would be something like this:</p>
  
  <pre><code>basket: {
      32012: {
          title: "foo",
          count: 1
      },
      32013: {
          title: "bar",
          count: 1
      }
  }
  </code></pre>
  
  <p>I persist it with redux-persist, it's working good when a new object has been add or remove from basket array, but when I update a child like this:</p>
  
  <pre><code>basket: {
      32012: {
          title: "foo",
          count: 4
      },
      32013: {
          title: "bar",
          count: 5
      }
  }
  </code></pre>
  
  <p>after refreshing page count would be 1 for each item!</p>
  
  <p>here is my rootReducer:</p>
  
  <pre><code>import {combineReducers} from 'redux';
  import {persistReducer} from 'redux-persist';
  import storage from 'redux-persist/lib/storage';
  import basketReducer from '../ducks/basket/reducers';
  const basketPersistConfig = {
      key: 'basket',
      storage: storage,
  };
  const rootReducer = combineReducers({
      basket: persistReducer(basketPersistConfig, basketReducer)
  });
  export default rootReducer;
  </code></pre>