Add support for merge request approvals api

[jnovick]

GitLab 10.6 will be release tomorrow (3/22/18) and includes new endpoints for merge request approvals. I just want to submit a feature request for these routes to be added. https://docs.gitlab.com/ee/api/merge_request_approvals.html

[jdalrymple]

Just looking over the docs. How are these changes for the library

Projects

• showApprovals (or approvals) -> gets config
• editApprovals -> update config
• editApprovers -> update approvers

Merge Requests

• showApprovals (or approvals) -> gets config
• editApprovals -> update config
• editApprovers -> update approvers
• approve -> approve MR
• unapprove -> unapprove MR

[jnovick]

I think that would be great! You responded ridiculously fast. I appreciate it. 👍

[jdalrymple]

Released in v3.0.0-rc.3

[Sryther]

It looks like the approvals method is not in the @gitbreaker/node v35.8.0 at least.