Updated CHANGELOG.md

Author: konakonall

CHANGELOG.md

@@ -9,9 +9,6 @@ Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 
 ## [v1.86](https://github.com/tencentyun/cos-python-sdk-v5/compare/v1.9.0...v1.86) - 2020-09-24
 
-1.紧急修复 request 重试 bug
-2. 更改 断点续传下载的chunk size大小
-
 ## [v1.9.0](https://github.com/tencentyun/cos-python-sdk-v5/compare/v1.8.7...v1.9.0) - 2020-11-05
 
 py2 and py3 setup