update path for that the app can start with npm

Author: Rezak OTMANI

packages/react-dev-utils/webpackHotDevClient.js

@@ -21,7 +21,7 @@ var stripAnsi = require('strip-ansi');
 var url = require('url');
 var launchEditorEndpoint = require('./launchEditorEndpoint');
 var formatWebpackMessages = require('./formatWebpackMessages');
-var ErrorOverlay = require('react-error-overlay');
+var ErrorOverlay = require('../react-error-overlay');
 
 ErrorOverlay.setEditorHandler(function editorHandler(errorLocation) {
   // Keep this sync with errorOverlayMiddleware.js