Create a merge request
gl_create_merge_request(project, source_branch, target_branch = "master",
title, description, verb = httr::POST, ...)
name or id of project (not repository!)
name of branch to be merged
name of branch into which to merge
title of the merge request
description text for the merge request
is ignored, will always be forced to match the action the function name indicates
passed on to gitlab
. Might contain more fields documented in gitlab API doc.