title: TypeError: this.Vue.axios is undefined when using axios HTTP driver
body: <p>Using <code>vue-auth</code> (<a href="https://github.com/websanova/vue-auth" rel="nofollow noreferrer">vue-auth on GitHub</a>) with the Axios HTTP driver I get the following error in the browser console:</p>
  
  <p><code>TypeError: this.Vue.axios is undefined</code></p>
  
  <p><strong>main.js</strong></p>
  
  <pre><code>import Vue from "vue";
  import App from "./App.vue";
  import axios from "axios";
  import "./libs/vue-auth";
  </code></pre>
  
  <p><strong>./libs/vue-auth.js</strong></p>
  
  <pre><code>import Vue from "vue";
  import vueAuth from "@websanova/vue-auth";
  import bearer from "@websanova/vue-auth/drivers/auth/bearer";
  import axiosHttp from "@websanova/vue-auth/drivers/http/axios.1.x";
  import vueRouter from "@websanova/vue-auth/drivers/router/vue-router.2.x";
  
  // Vue.axios = axios;
  
  Vue.use(vueAuth, {
    auth: bearer,
    http: axiosHttp,
    router: vueRouter
    // ...
  });
  </code></pre>
  
  <p>When removing the comment for <code>Vue.axios = axios;</code> it seems to work at first glance. So I thought moving <code>Vue.axios = axios;</code> to the <code>main.js</code> but then again it's not working.</p>