title: Vuetify: v-model looks deprecated
body: <p>I'm using Vuetify 1.0.14 to create my application.
  While I load a page though, I received this error message:</p>
  
  <pre><code>vuetify.js?dc48:19429 [Vuetify] v-model has been deprecated
  
  found in
  
  ---&gt; &lt;VExpansionPanelContent&gt;
  </code></pre>
  
  <p>Those are the lines of code this warning message refers to:</p>
  
  <pre><code>            &lt;v-expansion-panel&gt;
                  &lt;v-expansion-panel-content key="annotations" :value="sideFocusItem.default === 'annotations'"&gt;
                      &lt;div slot="header"&gt;Annotations:&lt;/div&gt;
                      &lt;annotations v-if="loadAnnotationBuilder"&gt;&lt;/annotations&gt;
                  &lt;/v-expansion-panel-content&gt;
              &lt;/v-expansion-panel&gt;
  </code></pre>
  
  <p>I have some trouble figuring out where <code>v-model</code> is used and how it's possible that it has been deprecated. It's only a warning but how can I fix that?</p>