provide a way to close a bunch of pull requests

[afeld]

In classes that use the fork strategy, teachers may leave students' pull requests open for review, so that they can submit updates, etc. This may leave them with a bunch of open pull requests across one or more repositories, so it would be helpful to have a command that takes care of them in bulk.

My thinking is to expand merge_pull_requests:

$ teachers_pet help pull_requests
Usage:
  teachers_pet pull_requests --repository=OWNER/REPO

Options:
  --repository=OWNER/REPO
  --merge   # Merges pull requests. Cannot be used in combination with --close.
  --close   # Closes pull requests. Cannot be used in combination with --merge.
  ...

Perform an action on all open pull requests in a particular repository

On the fence about whether it should be an even more generic issues command, though that may be confusing since most people probably think about them (and treat them) as separate things.

[afeld]

Hmm, maybe not necessary after all...