Update AUTHORS.txt

AUTHORS.txt

@@ -19,6 +19,7 @@ Haiyang Wang <ocean2811@outlook.com>
 Hugo Arregui <hugo@decentraland.org>
 John Bradley <jrb@turrettech.com>
 Juliusz Chroboczek <jch@irif.fr>
+kawaway <kawawa.y@gmail.com>
 Kazuyuki Honda <hakobera@gmail.com>
 Kevin Wang <kevmo314@gmail.com>
 Luke Curley <kixelated@gmail.com>
@@ -33,6 +34,7 @@ Sean DuBois <duboisea@twitch.tv>
 Sean DuBois <seaduboi@amazon.com>
 Sean DuBois <sean@siobud.com>
 Simone Gotti <simone.gotti@gmail.com>
+Steffen Vogel <post@steffenvogel.de>
 Tarrence van As <tarrence13@gmail.com>
 wangzixiang <wangzixiang@onething.net>
 Woodrow Douglass <wdouglass@carnegierobotics.com>