update contributors list (#989)

.mailmap

@@ -23,6 +23,8 @@ Gwynne Raskind <graskind@apple.com> <gwynne@darkrainfall.org>
 Kevin Sweeney <kevin_sweeney@apple.com> <kevin.t.sweeney@gmail.com>
 Lev Walkin <lwalkin@apple.com> <vlm@lionet.info>
 Ludovic Dewailly <ldewailly@apple.com> <me@ldewailly.com>
+Konrad `ktoso` Malawski <ktoso@apple.com> <konrad.malawski@project13.pl>
+Artem Redkin <aredkin@apple.com> <artem@redkin.me>
 Jovan Milenkovic <jovan.milenkovic@htecgroup.com> <jovanmilenkovic@live.com>
 Nathan Harris <nathan@mordil.info> <Mordil@users.noreply.github.com>
 Sergo Beruashvili <beruashvili@gmail.com> <2391557+ogres@users.noreply.github.com>

CONTRIBUTORS.txt

@@ -20,6 +20,7 @@ needs to be listed here.
 - Andrew Edwards <andrewangeta@gmail.com>
 - Ankit Aggarwal <ankit_aggarwal@apple.com>
 - Arjun Nayini <aanayini@gmail.com>
+- Artem Redkin <aredkin@apple.com>
 - Bas Broek <bas@basbroek.nl>
 - Ben Cohen <ben_cohen@apple.com>
 - Bouke Haarsma <bouke@haarsma.eu>
@@ -40,6 +41,7 @@ needs to be listed here.
 - Helge Heß <helge@alwaysrightinstitute.com>
 - Ian Partridge <i.partridge@uk.ibm.com>
 - Ilya Puchka <ilyapuchka@gmail.com>
+- JP Simard <jp@jpsim.com>
 - Jari (LotU) <j.koopman@jarict.nl>
 - Jason Toffaletti <jtoffaletti@apple.com>
 - Jim Dovey <jimdovey@mac.com>
@@ -50,6 +52,7 @@ needs to be listed here.
 - Karim ElNaggar <karimfarid.naggar@gmail.com>
 - Kevin Clark <kevin.clark@apple.com>
 - Kevin Sweeney <kevin_sweeney@apple.com>
+- Konrad `ktoso` Malawski <ktoso@apple.com>
 - Kyle Bashour <kylebshr@me.com>
 - Kyle Jessup <kyle@perfect.org>
 - Lev Walkin <lwalkin@apple.com>