fix(plugin): use globalName instead of $nuxt (fixes #345)

Author: pooya parsa

lib/plugin.js

@@ -2,6 +2,8 @@ import Axios from 'axios'
 import defu from 'defu'
 <% if (options.retry) { %>import axiosRetry from 'axios-retry'<% } %>
 
+const globalName = '<%= globalName %>'
+
 // Axios.prototype cannot be modified
 const axiosExtra = {
   setBaseURL (baseURL) {
@@ -126,7 +128,7 @@ const setupProgress = (axios) => {
     set: () => { }
   }
 
-  const $loading = () => (window.$nuxt && window.$nuxt.$loading && window.$nuxt.$loading.set) ? window.$nuxt.$loading : noopLoading
+  const $loading = () => (window[globalName] && window[globalName].$loading && window[globalName].$loading.set) ? window[globalName].$loading : noopLoading
 
   let currentRequests = 0