chore: link to README.zh-cn.md (#99)

Author: NeverBehave

README.md

@@ -1,7 +1,7 @@
 # vuex-router-sync [![CircleCI](https://circleci.com/gh/vuejs/vuex-router-sync.svg?style=svg)](https://circleci.com/gh/vuejs/vuex-router-sync)
 
 
-[中文版本 (Chinese Version)](/vuejs/vuex-router-sync/blob/master/README.zh-cn.md)
+[中文版本 (Chinese Version)](README.zh-cn.md)
 
 > Sync vue-router's current $route as part of vuex store's state.