Update CREDITS, courtesy bacek++.

CREDITS

@@ -16,6 +16,16 @@
         PPS: This file is encoded in UTF-8
 
 ----------
+N: Daniel Arbelo Arrocha
+U: darbelo
+E: arbelo@gmail.com
+D: Minor code contributions (plumage)
+
+N: Geoff Broadwell
+U: japhb
+E: geoff@broadwell.org
+D: Initial design and implementation of Plumage.
+
 N: Jonathan "Duke" Leto
 U: leto
 D: Perl 6 (Rakudo Perl) developer
@@ -31,4 +41,14 @@ U: pmichaud
 D: Perl 6 (Rakudo Perl) lead developer, pumpking
 E: pmichaud@pobox.com
 
+N: Stephen Weeks
+U: tene
+E: tene@allalone.org
+D: Assorted contributions (plumage)
+
+N: Vasily Chekalkin
+U: bacek
+D: Work on bringing Settings to NQP based on Plumage's NQPUtils.
+E: bacek@bacek.com
+
 =cut