git push報錯error: failed to push some refs to 'git@github.com:

git push報錯error: failed to push some refs to 'git@github.com:

$ git push -u origin master
To git@github.com:xxx/xxx.git
 ! [rejected]        master -> master (fetch first)
error: failed to push some refs to 'git@github.com:xxx/xxx.git'
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

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原因： 
GitHub遠端倉庫中的README.md檔案不在本地倉庫中。 
解決方案：

$ git pull --rebase origin master
$ git push -u origin master