Update maintainers list

Undin · Undin · commit 68096c33e1be · 2023-04-27T15:43:42.000+02:00
diff --git a/changelog.py b/changelog.py
@@ -31,6 +31,7 @@
     "yopox",
     "konrad-sz",
     "wbars",
+    "missingdays",
     "intellij-rust-bot",
     "dependabot[bot]"
 ]
