title: FirebaseAnimatedList change content in real time
body: <p>I'd like to know how to rebuild the FirebaseAnimatedList with a new query, new content changing the path.</p>
  
  <pre><code>new Flexible(
                child: new FirebaseAnimatedList(
                    query: query,
                    sort: (DataSnapshot a, DataSnapshot b) =&gt;
                        b.key.compareTo(a.key),
                    itemBuilder: (BuildContext context, DataSnapshot snapshot,
                        Animation&lt;double&gt; animation, int index) {...})
  </code></pre>
  
  <p>When i change the query in realtime it not changes the result in the list:</p>
  
  <pre><code>setState(() {
    query = "another/path";
  });
  </code></pre>