Add Kai Schlamp as an author

[ewjoachim]

Thank you @medihack :)

Successful PR Checklist:

• Tests
  • (not applicable?)
• Documentation
  • (not applicable?)

PR label(s):

• PR type: breaking 💥 Contains breaking changes
• PR type: feature ⭐️ Contains new features
• PR type: bugfix 🕵️ Contains bug fix
• PR type: miscellaneous 👾 Contains misc changes
• PR type: dependencies 🤖 Contains only dependencies updates
• PR type: documentation 📚 Contains documentation updates

[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.

[medihack]

I don't know if I really deserve this honor (probably not). And I have you to thank. You created this very useful library and have always been very kind and helpful.