Needs approval from an approver in each of these files:
- ~~[OWNERS](https://github.com/qiniu/api.v7/blob/master/OWNERS)~~ [Mei-Zhao,bachue]
Approvers can indicate their approval by writing `/approve` in a comment
Approvers can cancel approval by writing `/approve cancel` in a comment
Reverts qiniu/api.v7#225