git回滚到指定版本

$ git log -2
commit d9d7bd2dba3adc55a54f5b72a4acfe2f3eecb853 (HEAD, origin/dev)
Merge: c8071ea f71391f
Author: chensheng
Date:   Thu Jan 31 14:38:26 2019 +0800
Merge remote-tracking branch ‘origin/aba‘ into dev

commit f71391fa7ad2d5932a61902c13ddd8e6ec27ea93 (origin/aba)
Author: chensheng
Date:   Thu Jan 31 14:36:42 2019 +0800
需求编号：12345

修改时间：2018-1-31
修改人：chens
修改内容：

wulf@wulf00 MINGW64 /e/workspace/wlf-hello-service ((d9d7bd2...))
$ git reset --hard f71391fa7ad2d5932a61902c13ddd8e6ec27ea93
HEAD is now at f71391f 需求编号：12345
wulf@wulf00 MINGW64 /e/workspace/wlf-hello-service ((f71391f...))
$ git push -f origin dev