fix(example): unused event

modules/examples/src/todo/index.ts

@@ -10,7 +10,7 @@ class TodoApp {
 
   constructor(public todoStore: Store, public factory: TodoFactory) {}
 
-  enterTodo($event, inputElement): void {
+  enterTodo(inputElement): void {
     this.addTodo(inputElement.value);
     inputElement.value = '';
   }

modules/examples/src/todo/todo.html

@@ -9,7 +9,7 @@
       placeholder="What needs to be done?"
       autofocus
       #newtodo
-      (keyup.enter)="enterTodo($event, newtodo)">
+      (keyup.enter)="enterTodo(newtodo)">
   </header>
 
   <section id="main">