Display pull requests for external contributors.

[dblock]

Description

$ ./bin/project --quiet contributors prs --from=2021-03-14 --page=365
https://github.com/user
  company
  bio
  prs

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[dblock]

CodeCov failed.