fix(iview): register plugin only once (#234)

Author: Pooya Parsa

template/frameworks/iview/plugins/iview.js

@@ -2,8 +2,6 @@ import Vue from "vue";
 import iView from "iview";
 import locale from "iview/dist/locale/en-US"; // Change locale, check node_modules/iview/dist/locale
 
-export default () => {
-  Vue.use(iView, {
-    locale
-  });
-}
+Vue.use(iView, {
+  locale
+});