add aiuto as code owner. direct changes to distribution/ to them (#187)

diff --git a/CODEOWNERS b/CODEOWNERS
index d7feba7..df9b78c 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -1 +1,2 @@
-* @c-parsons @laurentlb @jin
+* @c-parsons @laurentlb @jin @aiuto
+distribution/ @aiuto @fwe