IDEA点击GIT更新按钮时，报错如下：
Can't Update
No tracked branch configured for branch master or the branch doesn't exist. To make your branch track a remote branch call, for example, git branch --set-upstream-to origin/master master
解决办法：
在IDEA的Terminal中，执行如下命令即可解决问题：
git branch --set-upstream master origin/master
