[Misc] Update contributors list

Author: Mordil

CONTRIBUTORS.txt

@@ -15,6 +15,8 @@ needs to be listed here.
 - Cory Benfield <lukasa@apple.com>
 - Fabian Fett <fabianfett@apple.com>
 - George Barnett <gbarnett@apple.com>
+- Gwynne Raskind <gwynne@vapor.codes>
+- Marius Seufzer <marius.seufzer@proton.me>
 - Michael Stegeman <michael@stegeman.me>
 - Nathan Harris <nathan@mordil.info>
 - Ondrej Rafaj <ondrej.rafaj@gmail.com>