ensure priority for v-link-active

Author: yyx990803

src/directives/link.js

@@ -16,12 +16,14 @@ export default function (Vue) {
   } = Vue.util
 
   Vue.directive('link-active', {
+    priority: 1001,
     bind () {
       this.el.__v_link_active = true
     }
   })
 
   Vue.directive('link', {
+    priority: 1000,
 
     bind () {
       const vm = this.vm