push Github的时候，出现了一句错误提示：
error: failed to push some refs to 'https://github.com/......'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
想到也没做什么，就直接强制push了。
git push -u origin master -f
总感觉哪里不太对，合作项目的时候，还是建议不要用这种方法的好。
顺便搜索了下别的解决方案：
1. push前先将远程repository修改pull下来：
git pull origin master
git push -u origin master
2. 若不想merge远程和本地修改，可以先创建新的分支：
git branch [name]
git push -u origin [name]
