- With `brew contributions`, this will output a list of stats
(across the specified time period, or all time) for people in the
"maintainers" team on GitHub.
- Add a `--user` flag for getting stats for a specific user (either
username, name or email address).
- This assumes that their Git committer details are the same as their name is
set to on GitHub.
- Show an error message if trying to generate a CSV for the full maintainer
list, since I haven't worked out how to best show all of that info yet (or
even how best to show only the totals across everything for every user) in
that format.
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