以tag v1.1.7为例:
git checkout v1.1.7
#检出tag v1.1.7
git branch v1.1.7-bak
#备份tag
git checkout developer
#检出developer
git branch developer-bak
#备份developer
git branch -d developer
#删除developer分支
git checkout v1.1.7
#切换到tag v1.1.7
git branch developer
#检出分支 developer
git push origin:developer
#推送到远程