Add me as a maintainer of keybox

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18156 a1c6a512-1295-4272-9138-f99709370657
diff --git a/docs/MAINTAINERS b/docs/MAINTAINERS
index 5f84182..a64eeb7 100644
--- a/docs/MAINTAINERS
+++ b/docs/MAINTAINERS
@@ -175,6 +175,7 @@
 :jackpot: Kévin Ferrare
 :jewels: Antoine Cellerier
 :jpeg:
+:keybox: Nils Wallménius
 :logo:
 :mandelbrot: Jens Arnold
 :maze: