Always assign an active contributor

[garno]

Sometimes, we select a contributor who haven’t been active on the project for a while. This is ok since their input is valuable but we might want to make sure a more active contributor, who is in the loop of what is being done, is assigned.

The solution is quite simple but it will result in more people being assigned as reviewers. We select 2 contributors based on relevancy:

• One with the current flow
• One who has been active in the last 90 days

Thoughts?

Bonus : A repository could opt out of this feature with the per-repository configuration mentionned in the issue #18.

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