Update matthias-obst.md
Update matthias-obst.md

remove Matthias Obst from Workgroup and add his name to Project office
neicnordic/experimental.neic.nordforsk.org,neicnordic/experimental.neic.nordforsk.org,neicnordic/neic.no,neicnordic/neic.no,neicnordic/neic.no,neicnordic/experimental.neic.nordforsk.org