update vue2 release

Author: dingyiming

themes/vue/_config.yml

@@ -1,3 +1,3 @@
 google_analytics: UA-46852172-1
 root_domain: vuefe.cn
-vue_version: 2.0.0-rc.8
+vue_version: 2.0正式版

themes/vue/layout/index.ejs

@@ -9,7 +9,7 @@
     <div class="left">
       <img class="hero-logo" src="/images/logo.png">
     </div><div class="right">
-      <h2 class="vue">Vue.js</h2>
+      <h2 class="vue">Vue.js 2.0正式版</h2>
       <h1>
         先进的<br>JavaScript 框架
       </h1>