chore: update sponsors (#1450)

Author: vuejs-jp-bot

themes/vue/_config.yml

@@ -3,8 +3,6 @@ google_analytics: UA-46852172-1
 root_domain: jp.vuejs.org
 vue_version: 2.5.16
 platinum_sponsors_china:
-  - url: 'https://e.coding.net/?utm_source=vue.js'
-    img: coding.png
   - url: 'http://www.dcloud.io/?hmsr=vuejsorg&hmpl=&hmcu=&hmkw=&hmci='
     img: dcloud.gif
 special_sponsors: