docs: update the CREDITS file

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

Author: drakenclimber

CREDITS

@@ -40,11 +40,14 @@ Marcus Meissner <meissner@suse.de>
 Markos Chandras <markos.chandras@imgtec.com>
 Mathias Krause <minipli@googlemail.com>
 Michael Forney <mforney@mforney.org>
+Michael Karcher <github@mkarcher.dialup.fu-berlin.de>
 Mike Frysinger <vapier@gentoo.org>
 Mike Strosaker <strosake@linux.vnet.ibm.com>
 Miroslav Lichvar <mlichvar@redhat.com>
 Paul Moore <paul@paul-moore.com>
+Rodrigo Campos <rodrigo@kinvolk.io>
 Rolf Eike Beer <eb@emlix.com>
+Samanta Navarro <ferivoz@riseup.net>
 Serge Hallyn <serge.hallyn@ubuntu.com>
 Stéphane Graber <stgraber@ubuntu.com>
 Stephen Coleman <omegacoleman@gmail.com>