chore: clean changelog

Author: kiaking

CHANGELOG.md

@@ -1,29 +1,13 @@
-# [6.0.0](https://github.com/vuejs/vuex-router-sync/compare/v5.0.0...v6.0.0) (2020-04-25)
-
-
-
 # [5.0.0](https://github.com/vuejs/vuex-router-sync/compare/v4.1.0...v5.0.0) (2017-10-12)
 
-
 ### Features
 
 * add API for unsync([#66](https://github.com/vuejs/vuex-router-sync/issues/66)) ([693aa76](https://github.com/vuejs/vuex-router-sync/commit/693aa761f9e47df7f07c49c799c627b86d094402)), closes [#64](https://github.com/vuejs/vuex-router-sync/issues/64)
 
-
-
 # [4.1.0](https://github.com/vuejs/vuex-router-sync/compare/v4.0.1...v4.1.0) (2017-01-02)
 
-
-
 ## [4.0.1](https://github.com/vuejs/vuex-router-sync/compare/v4.0.0...v4.0.1) (2016-12-14)
 
-
-
 # [4.0.0](https://github.com/vuejs/vuex-router-sync/compare/v2.0.0...v4.0.0) (2016-12-14)
 
-
-
 # 2.0.0 (2016-06-30)
-
-
-