Enable Redux dev tools to help debugging

Author: textbook

src/App.js

@@ -1,15 +1,17 @@
 import React from 'react'
 import { Provider } from 'react-redux'
 import { BrowserRouter as Router } from 'react-router-dom'
-import { applyMiddleware, createStore } from 'redux'
+import { applyMiddleware, compose, createStore } from 'redux'
 import ReduxThunk from 'redux-thunk'
 import './App.css'
 import Footer from './Components/Footer'
 import Navbar from './Components/Navbar'
 import reducers from './Redux/Reducer'
 import Routes from './Routes'
 
-const store = createStore(reducers, applyMiddleware(ReduxThunk))
+const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
+const store = createStore(reducers, composeEnhancers(applyMiddleware(ReduxThunk)))
+
 const App = () => (
   <Provider store={store}>
     <Router>