title: Getting a payload after calling 'update' method of CartEntryConnector
body: <p>I used 'updateEntry' method of ActiveCartService for updating the entry of the Cart. After then 'updateEntry$' effect from the CartEntryEffects class was triggered that returned new action. </p>
  
  <pre><code>updateEntry$: Observable = this.actions$.pipe(
      ofType(CartActions.CART_UPDATE_ENTRY),
      map((action: CartActions.CartUpdateEntry) =&gt; action.payload),
      concatMap(payload =&gt;
        this.cartEntryConnector
          .update(payload.userId, payload.cartId, payload.entry, payload.qty)
          // should be my logic with payload
          .pipe(
            map(() =&gt; {
              return new CartActions.CartUpdateEntrySuccess({
                userId: payload.userId,
                cartId: payload.cartId,
              });
            }),
  </code></pre>
  
  <p>Which is the proper way to get this payload? 
  Or can I override this effect or add my logic to it? </p>