Auto-assign maintainer to new issues

[bkeepers]

From @benbalter in probot/probot#17:

Another behavior of @jekyllbot (that's relatively new), when an issue comes in and @mentions an affinity team, one of the team captains are randomly assigned the issue. They're obviously free to unassigned or change assignment, but it creates a sense of distributed ownership of issues, based on where they are in the codebase.

[evertonfraga]

I've set up this simple Probot app that will auto-assign one of the maintainers to any created issue.

It looks for a plain list of maintainers in .github/config.yml and uses issue.number % maintainers.length in order to choose which maintainer gets what issue.

Feedback and best practices appreciated. Planning to write two more that fit my needs.

https://github.com/evertonfraga/probot-auto-assigner

[JasonEtco]

@evertonfraga awesome! FYI that repo is private 🔒

[evertonfraga]

Sorry, late night blooper. It's public now 😄