fix: Configure rollup packaging to exclude vue

Author: staticdeng

lib/index.js

@@ -1,6 +1,6 @@
 {
   "name": "vuejs-loadmore",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "description": "A pull-down refresh and pull-up loadmore scroll component for Vue.js",
   "entry": "packages/index.js",
   "main": "lib/index.js",

lib/index.module.js

@@ -59,5 +59,6 @@ export default {
       }
     }
   ],
-  plugins: getPlugins()
+  plugins: getPlugins(),
+  external: ['vue']
 };