githug新增第41关rebase_onto解决方案

githug新增了一关，原题为：

E:\githug\git_hug>githug reset 41
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*                 Githug                            *
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resetting level

Name: rebase_onto
Level: 41
Difficulty: **

You have created your branch from `wrong_branch` and already made some commits, 
and you realise that you needed to create your branch from `master`. 
Rebase your commits onto `master` branch so that you don't have `wrong_