docs: add Tobias as co-maintainer

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
build_geip.sh: #!/bin/bash

Signed-off-by: Jon Schipp <jonschipp@gmail.com>
astraceroute: Fix typo in message

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>