fix ESLint: 'axios' is defined but never used.

Author: lisgroup

admin/src/views/markdown/index.vue

@@ -15,7 +15,7 @@ import { mavonEditor } from 'mavon-editor'
 import 'mavon-editor/dist/css/index.css'
 // use
 // Vue.use(mavonEditor)
-import axios from 'axios'
+// import axios from 'axios'
 
 export default {
   components: {