chore: add Volker Diels-Grabsch as contributor

muzimuzhi · muzimuzhi · commit b97dfb6a504f · 2024-07-15T07:40:33.000+08:00
Signed-off-by: Yukai Chou &lt;muzimuzhi@gmail.com&gt;
diff --git a/doc/generic/pgf/CHANGELOG.md b/doc/generic/pgf/CHANGELOG.md
@@ -40,6 +40,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Yukai Chou (@muzimuzhi)
 - Alexander Grahn
 - Max Chernoff
+- Volker Diels-Grabsch
 
 ## [3.1.10] - 2023-01-13 Henri Menke
 
