Update AUTHORS.txt

AUTHORS.txt

@@ -20,14 +20,17 @@ Konstantin Itskov <konstantin.itskov@kovits.com>
 Lukas Herman <lherman.cs@gmail.com>
 Luke Curley <lcurley@twitch.tv>
 Michael MacDonald <github@macdonald.cx>
+Michael Tuexen <tuexen@fh-muenster.de>
 ronan <ronan.jezequel@gmail.com>
 Sam Lancia <sam@vaion.com>
 Sean DuBois <seaduboi@amazon.com>
+Sean DuBois <sean@pion.ly>
 Sean DuBois <sean@siobud.com>
 Steffen <post@steffenvogel.de>
 Steffen Vogel <post@steffenvogel.de>
 Teddy <richardgeorgeoff@gmail.com>
 Will Forcey <wsforc3y@gmail.com>
+Yutaka <yt0916@gmail.com>
 Yutaka Takeda <yt0916@gmail.com>
 ZHENK <chengzhenyang@gmail.com>