title: 'query' does not exist in type 'QueryFn' | angularfire2
body: <p>Argument of type '{ query: { limitTolast: number; orderByKey: boolean; }; }' is not assignable to parameter of type 'QueryFn'.Object literal may only specify known properties, and 'query' does not exist in type 'QueryFn'.</p>
  
  <p>package.json </p>
  
  <pre><code>"angularfire2": "^5.0.0-rc.3",
  "firebase": "^4.5.1",
  </code></pre>
  
  <p>chat.service.ts</p>
  
  <pre><code>getMessages(): FirebaseListObservable&lt;ChatMessage[]&gt; {
      return this.db.list('messages', {
        query: { limitTolast : 25, orderByKey: true}
      });
    }
  </code></pre>