Failed to push

[m-raj]

mayank@mayank-Inspiron-N5010:/var/www/html/mediawiki$ git push -u origin master
Username for 'https://github.com': debuggermayank
Password for 'https://[email protected]':
To https://github.com/The-WebOps-Club/iitm-wiki
! [rejected] master -> master (fetch first)
error: failed to push some refs to 'https://github.com/The-WebOps-Club/iitm-wiki'
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.