upgrade vue 2.5.2 (vuejs#409)

Author: kazupon

src/v2/guide/installation.md

@@ -3,11 +3,11 @@ title: インストール
 updated: 2017-10-11
 type: guide
 order: 1
-vue_version: 2.4.1
-dev_size: "257.91"
-min_size: "79.71"
-gz_size: "28.96"
-ro_gz_size: "20.18"
+vue_version: 2.5.2
+dev_size: "272.26"
+min_size: "83.31"
+gz_size: "30.38"
+ro_gz_size: "21.10"
 ---
 
 ### 互換性の注意

themes/vue/_config.yml

@@ -1,4 +1,4 @@
 site_description: "Vue.js - The Progressive JavaScript Framework"
 google_analytics: UA-46852172-1
 root_domain: vuejs.org
-vue_version: 2.4.1
+vue_version: 2.5.2