CMakeLists: Update the contributor list
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 30d90f7..34b7763 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,9 +4,14 @@
# Copyright (C) 2007,2009-2018 Glenn Randers-Pehrson
# Written by Christian Ehrlicher, 2007
# Revised by Roger Lowman, 2009-2010
-# Revised by Clifford Yapp, 2011-2012
+# Revised by Clifford Yapp, 2011-2012,2017
# Revised by Roger Leigh, 2016
# Revised by Andreas Franek, 2016
+# Revised by Sam Serrels, 2017
+# Revised by Vadim Barkov, 2017
+# Revised by Vicky Pfau, 2018
+# Revised by Cameron Cawley, 2018
+# Revised by Cosmin Truta, 2018
# This code is released under the libpng license.
# For conditions of distribution and use, see the disclaimer