rn-129: add Štěpán Němec among the helpers

Author: chriscool

rev_news/drafts/edition-129.md

@@ -601,4 +601,4 @@ 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 Bruno Brito and D. Ben Knoble.
+with help from Štěpán Němec, Bruno Brito and D. Ben Knoble.