Whedon should remind reviewers (and authors)

[arfon]

Currently our guidelines state that reviewers should try and complete their reviews in ~6 weeks but our review times are often much longer 😞

Anecdotally, one challenge we face is that many reviewers often don't begin their reviews until close to the end of the 6 week window (or longer), which can significantly delay the review process.

A couple of types of reminders we could try to help try and expedite the process:

• Have Whedon ping any reviewer who hasn't accepted their invite to the joss-reviews repo within ~72 hours.
• Have Whedon ping any reviewer after ~7 days (?) who hasn't either 1) commented on the review yet, or 2) checked off any of their review checklist items.

[arfon]

Implementation-wise, this may make sense to add as a rake task in openjournals/joss that runs daily rather than implementing here.