Fix changelog tooling to report contributors

[sjsrey]

Currently, they are getting truncated.

[jGaboardi]

See @martinfleis's comment here.

[jGaboardi]

@martinfleis and I have had success over in tigernet by adding .github/release.yml and updating .github/workflows/release_and_publish to automatically generate release notes.

See also pysal/spaghetti#655 and pysal/momepy#307

[martinfleis]

See also my point in pysal/spopt#199 (comment)