fix reducer error, bump version

Author: aksonov

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-native-router-flux",
-  "version": "4.0.4",
+  "version": "4.0.5",
   "description": "React Native Router using Flux architecture",
   "repository": {
     "type": "git",

src/Reducer.js

@@ -3,11 +3,9 @@ import { NavigationActions, StackActions } from 'react-navigation';
 import * as ActionConst from './ActionConst';
 import { getActiveState, popPrevious } from './State';
 
-export default function createReducer(navigationStore) {
+export default function createReducer() {
   return (state, action) => {
-    if (!navigationStore) {
-      navigationStore = require('./navigationStore').default;
-    }
+    const navigationStore = require('./navigationStore').default;
     const { type, routeName } = action;
     if (type === ActionConst.POP_TO) {
       let nextScene = '';

src/navigationStore.js

@@ -520,7 +520,7 @@ class NavigationStore {
 
   setCustomReducer = (Navigator) => {
     this.getStateForAction = Navigator.router.getStateForAction;
-    const reducer = createReducer(this);
+    const reducer = createReducer();
     Navigator.router.getStateForAction = (cmd, state) => (this.reducer ? this.reducer(state, cmd) : reducer(state, cmd));
   };