feat: lookup Github username if token is available

[JohnCampionJr]

🔗 Linked issue

#116

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Using @antfu's changelogithub as inspiration, I added this feature to changelogen.

If a GitHub token is available, it will retrieve usernames through the GitHub API. Otherwise, it returns the exact same author info as before.

Added tests with both a token and without a token.

Resolves #116

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[JohnCampionJr]

I have no idea why the test is failing; it works here. Is the ungh API not available in CI?

[pi0]

Nice work ❤️

[JohnCampionJr]

@pi0 all set!

[JohnCampionJr]

@pi0 any chance of getting this merged?

[marlondecol]

Hey! I believe this change would be very valuable and I’d really like to see it implemented. Let me know if there’s anything I can do to help!

[PKief]

@marlondecol @pi0 I've created a follow up PR which will resolve the username from the PR which is referenced in the commit references. This will also find the correct username of the users who don't have a public email address in github: #294