feat(store): use __REDUX_DEVTOOLS_EXTENSION__ to access Chrome's Redu…

…x extension

pass those as the second argument to 'createStore'

src/store.js

@@ -1,6 +1,8 @@
 import { createStore, applyMiddleware } from 'redux';
 import thunk from 'redux-thunk';
 
+const REDUX_DEVTOOLS = window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__();
+
 import reducer from './reducers';
 
-export default createStore(reducer, applyMiddleware(thunk));
+export default createStore(reducer, REDUX_DEVTOOLS, applyMiddleware(thunk));