fixed missing service inject

Author: thiago-negri

sample/app/contacts/contacts-service.js

@@ -3,7 +3,7 @@ angular.module('uiRouterSample.contacts.service', [
 ])
 
 // A RESTful factory for retrieving contacts from 'contacts.json'
-.factory('contacts', ['$http', function ($http, utils) {
+.factory('contacts', ['$http', 'utils', function ($http, utils) {
   var path = 'assets/contacts.json';
   var contacts = $http.get(path).then(function (resp) {
     return resp.data.contacts;
@@ -19,4 +19,4 @@ angular.module('uiRouterSample.contacts.service', [
     })
   };
   return factory;
-}]);
+}]);