Add support for merging MR about gitlab-merge-request-resource

[avanier]

Yep, that'd be nice.

[cloudlena]

I guess you're talking about https://docs.gitlab.com/ee/api/merge_requests.html#accept-mr. Do you guys have any suggestion on where to implement it? I guess it would have to be a set of parameters on the out script but that's not going to be very easy because currently the out script doesn't know about the merge request so it's missing the merge_request_iid parameter to call the API endpoint. That would need to be passed to it somehow because currently only the check script knows about it.

[Typositoire]

Sorry about the delay in response :p

The way the Github version works is actually on OUT. Dunno if you could kind of mimic what's been done there. https://github.com/jtarchie/github-pullrequest-resource