automated merging not working if total reviewers is under the minimum reviewer quota

[gentlementlegen]

There is a scenario where a pull-request can have all the validations from the reviewers but won't get merged because the amount of reviewers is under the amount of required reviewers.

Example

A review has 2 validations out of 2 reviewers, but 3 are required.

Possible solutions

Merge when 100% of reviewers validated

Pros:

• avoids the automated merging to be stuck
• doesn't require multiple validations on small / simple tasks

Cons:

• dangerous, even more for outsider pull-requests, that could be merged only with one validation
• could be missed by the team that wouldn't notice the merging happening

Post a message saying that the PR can be merged, but requires n more reviewers

Pros:

• safe, wouldn't automatically merge the pull-request without meeting the requirements
• could even notify the team about the required reviews

Cons:

• might require multiple reviews for simple tasks
• can increase noise, and delay merging

Partially relates to #5