title: Nuxt auth getToken witnin async is undefined
body: <p>I am trying to fetch some data from user and  I need to pass bearer token within call.</p>
  
  <pre><code>async asyncData () {
      let response = await axios.get('dataURL', {}, { headers: {"Authorization" : `Bearer ${this.$auth.getToken('local')}`} })
    },
  </code></pre>
  
  <p>But this doesn't work, it always says that $auth is undefined, while within template I can easily output any $auth property...</p>
  
  <p>How can I get bearer token within async?</p>