rn-128: add Kristoffer among the helpers

Author: chriscool

_posts/2025-10-31-edition-128.markdown

@@ -541,4 +541,4 @@ Christian Couder &lt;<christian.couder@gmail.com>&gt;,
 Jakub Narębski &lt;<jnareb@gmail.com>&gt;,
 Markus Jansen &lt;<mja@jansen-preisler.de>&gt; and
 Kaartic Sivaraam &lt;<kaartic.sivaraam@gmail.com>&gt;
-with help from XXX.
+with help from Kristoffer Haugsbakk.