Updates were rejected because the tip of your current branch is behind

刚创建的github版本库，在push代码时出错：
$ git push -u origin master
To [email protected]:******/Demo.git
 ! [rejected] master -> master (non-fast-forward)
error: failed to push some refs to '[email protected]:******/Demo.git'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Merge the remote changes (e.g. 'git pull')
hint: before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

网上搜索了下，是因为远程repository和我本地的repository冲突导致的，而我在创建版本库后，在github的版本库页面点击了创建README.md文件的按钮创建了说明文档，但是却没有pull到本地。这样就产生了版本冲突的问题。

1.使用强制push的方法：
$ git push -u origin master -f 
这样会使远程修改丢失，一般是不可取的，尤其是多人协作开发的时候。慎用，慎用！！！
2.push前先将远程repository修改pull下来
$ git pull origin master
$ git push -u origin master
3.若不想merge远程和本地修改，可以先创建新的分支：
$ git branch [name]
然后push
$ git push -u origin [name]