title: Change one file of merge request without raising a new merge request
body: <p>I did some changes in dev branch , committed and pushed (<code>git push origin dev</code>)and created a new merge request from gitlab frontend . But now i want to modify 1 file in same merge request without raising new one . Can I delete dev branch on remote and change that file on local, commit  and push again as <code>git push origin dev</code> . Will this harm my current merge request ? </p>