Fixes

• Improve GitHub client to handle case where no public e-mail is available.
  • Scope user:email is now required for this to work
  • You should enable Email addresses permission in the Permissions & events section of your GitHub app parameters. You can find it at https://github.com/settings/apps/{YOUR_APP}/permissions.

Improvements

• Bump dependencies:
  • httpx >=0.15,<0.18