Update MAINTAINERS file
Update MAINTAINERS file

the script in docker/opensource didn't like the format :-)

also updated runcom's e-mail address

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

xytis/go-plugins-helpers,docker/go-plugins-helpers