Sponsor needed for gotestsum please!

[Arnaud Rebillout <arnaud.rebillout@collabora.com>]

  Dear go team,

is there anyone willing to review and upload a new package "gotestsum":

https://salsa.debian.org/go-team/packages/gotestsum

It's a simple package, and it's a dependency of the docker.io test 
suite, starting from version 18.09.9.

The only thing left to do is to finalize the changelog, add a git tag, 
and upload the package.

Thanks!

  Arnaud