git 清空所有commit记录

说明：例如将代码提交到git仓库，将一些敏感信息提交，所以需要删除提交记录以彻底清除提交信息，以得到一个干净的仓库且代码不变

1.Checkout

git checkout --orphan latest_branch

2. Add all the files

git add -A

3. Commit the changes

git commit -am "commit message"

4. Delete the branch

git branch -D master

5.Rename the current branch to master

git branch -m master

6.Finally, force update your repository

git push -f origin master