Fix laggy keyup events in Vue example (#2085)

examples/vue/index.html

@@ -11,7 +11,7 @@
 		<section class="todoapp" v-cloak>
 			<header class="header">
 				<h1>todos</h1>
-				<input class="new-todo" autofocus autocomplete="off" placeholder="What needs to be done?" v-model="newTodo" @keyup.enter="addTodo">
+				<input class="new-todo" autofocus autocomplete="off" placeholder="What needs to be done?" v-model="newTodo" @keydown.enter="addTodo">
 			</header>
 			<section class="main" v-show="todos.length">
 				<input id="toggle-all" class="toggle-all" type="checkbox" v-model="allDone">
@@ -23,7 +23,7 @@ <h1>todos</h1>
 							<label @dblclick="editTodo(todo)">{{todo.title}}</label>
 							<button class="destroy" @click="removeTodo(todo)"></button>
 						</div>
-						<input class="edit" type="text" v-model="todo.title" v-todo-focus="todo == editedTodo" @blur="doneEdit(todo)" @keyup.enter="doneEdit(todo)" @keyup.esc="cancelEdit(todo)">
+						<input class="edit" type="text" v-model="todo.title" v-todo-focus="todo == editedTodo" @blur="doneEdit(todo)" @keydown.enter="doneEdit(todo)" @keydown.esc="cancelEdit(todo)">
 					</li>
 				</ul>
 			</section>