Add Łukasz Stelmach to CREDITS for FS#11785

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28963 a1c6a512-1295-4272-9138-f99709370657
diff --git a/docs/CREDITS b/docs/CREDITS
index 5e9864b..8ff7fb1 100644
--- a/docs/CREDITS
+++ b/docs/CREDITS
@@ -577,6 +577,7 @@
 Ryan Sawhill
 Thomas Jarosch
 Will Sowerbutts
+Łukasz Stelmach
 
 The libmad team
 The wavpack team