Merge request merge missing 'auto_merge' #1052

MergeRequestMerge is missing AutoMerge property for merge API (https://docs.gitlab.com/api/merge_requests/#merge-a-merge-request). Also MergeWhenPipelineSucceeds is deprecated for newer GitLab version.

This pose problem when pipeline is still running for MR. Request results in error 405 in such case instead of setting auto merge flag.