Update COMMITTERS

Signed-off-by: Alphan Ulusoy <alphan@google.com>
diff --git a/COMMITTERS b/COMMITTERS
index f904f16..3468fa4 100644
--- a/COMMITTERS
+++ b/COMMITTERS
@@ -8,13 +8,12 @@
 Committer list:
 * Alex Bradbury (asb)
 * Mark Branstad (mwbranstad)
-* Greg Chadwick (gregac)
+* Greg Chadwick (GregAC)
 * Cindy Chen (cindychip)
 * Timothy Chen (tjaychen)
 * Jon Flatley (jon-flatley)
 * Chris Frantz (cfrantz)
 * Srikrishna Iyer (sriyerg)
-* Udi Jonnalagadda (udinator)
 * Eunchan Kim (eunchan)
 * Martin Lueker-Boden (martin-lueker)
 * Rasmus Madsen (rasmus-madsen)
@@ -23,13 +22,10 @@
 * Michael Munday (mundaym)
 * Miguel Osorio (moidx)
 * Dominic Rizzo (domrizz0)
-* Tom Roberts (tomroberts-lowrisc)
 * Michael Schaffner (msfschaffner)
 * Rupert Swarbrick (rswarbrick)
 * Silvestrs Timofejevs (silvestrst)
 * Alphan Ulusoy (alphan)
 * Pirmin Vogel (vogelpi)
-* Philipp Wagner (imphil)
-* Tobias Wölfel (towoe)
 * Weicai Yang (weicaiyang)
 * Miguel Young (mcy)