Hello Robert,

in order to improve the maintainability of the protobuf-c package, you should
be adding a debian/watch file (to track new upstream versions) and an
autopkgtest in debian/tests/control.

In Ubuntu, the attached patch was applied to achieve the following:

  * Add d/watch and run the self tests as autopkgtest

Thanks for considering the patch.

Cheers,
  Lukas