feat(username): Add Username updating

client/src/redux/rootReducer.js

@@ -2,8 +2,10 @@ import { combineReducers } from 'redux';
 
 import { reducer as app } from './';
 import { reducer as flash } from '../components/Flash/redux';
+import { reducer as settings } from './settings';
 
 export default combineReducers({
   app,
-  flash
+  flash,
+  settings
 });