title: Hamburger icon not showing in Vuetify 2.0
body: <p>I am upgrading to the new vuetify 2.0, and I noticed the hamburger icon is not showing on the app bar.</p>
  
  <p>In their examples with the same code, it does show.</p>
  
  <p><a href="https://vuetifyjs.com/en/components/app-bars" rel="nofollow noreferrer">https://vuetifyjs.com/en/components/app-bars</a></p>
  
  <p><a href="https://codepen.io/anon/pen/rXLyzE?&amp;editable=true&amp;editors=101" rel="nofollow noreferrer">https://codepen.io/anon/pen/rXLyzE?&amp;editable=true&amp;editors=101</a></p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
      &lt;title&gt;&lt;/title&gt;
      &lt;meta charset="UTF-8"&gt;
      &lt;meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no, minimal-ui"&gt;
      &lt;link rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/icon?family=Material+Icons"&gt;
      &lt;link href="https://cdn.jsdelivr.net/npm/vuetify/dist/vuetify.min.css" rel="stylesheet"&gt;
      &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"&gt;&lt;/script&gt;
      &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.10/vue.min.js"&gt;&lt;/script&gt;
      &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/vuex/3.1.1/vuex.min.js"&gt;&lt;/script&gt;
      &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/vue-router/3.0.6/vue-router.min.js"&gt;&lt;/script&gt;
      &lt;script src="https://cdn.jsdelivr.net/npm/vuetify/dist/vuetify.min.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
      &lt;body&gt;
          &lt;div id="app"&gt;
              &lt;v-app&gt;
                  &lt;v-app-bar absolute dark&gt;
                      &lt;v-app-bar-nav-icon&gt;&lt;/v-app-bar-nav-icon&gt;
                      &lt;v-toolbar-title&gt;Title&lt;/v-toolbar-title&gt;
                      &lt;v-spacer&gt;&lt;/v-spacer&gt;
                      &lt;v-btn icon&gt;
                        &lt;v-icon&gt;search&lt;/v-icon&gt;
                      &lt;/v-btn&gt;
                  &lt;/v-app-bar&gt;
              &lt;/v-app&gt;
          &lt;/div&gt;
          &lt;script&gt;
              new Vue({
                  el: '#app',
                  vuetify: new Vuetify(),
                  data: () =&gt; ({
                  })
              });
          &lt;/script&gt;
      &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>What am I missing?</p>
  
  <p>Thanks</p>