在Github上新建一个带有Readme.md的仓库，并且第一次将它pull到本地新的仓库时，经常出现
$ git pull
There is no tracking information for the current branch.
Please specify which branch you want to merge with.
See git-pull(1) for details.
git pull <remote> <branch>
If you wish to set tracking information for this branch you can do so with:
git branch --set-upstream-to=origin/<branch> master
解决方法：
git pull origin [branchname] --allow-unrelated-histories
