Update Authors

AUTHORS

@@ -255,6 +255,7 @@ Sascha Westermann <sascha.westermann@hl-services.de>
 Sebastian Brückner <mail@invlid.com>
 Sebastian Chrostek <sebastian@chrostek.net>
 Sebastian Eikenberg <eikese@mail.uni-paderborn.de>
+Sebastian Grund <s.grund@openinfrastructure.de>
 Sebastian Marsching <sebastian-git-2016@marsching.com>
 Silas <67681686+Tqnsls@users.noreply.github.com>
 Simon Murray <spjmurray@yahoo.co.uk>