Add OpenAPI to documentation

Change-Id: I49a372d346bdea68dfae3e169bd62822a0259218
diff --git a/Changes b/Changes
index 8cbeafa..025c619 100644
--- a/Changes
+++ b/Changes
@@ -1,4 +1,5 @@
 0.53 2024-03-15
+        - Add openapi url to documentation. (hebasta)
         - Solve a potential timing issue in VC rendering. (diewald)
         - Update DeReKo link in corpus specific localization. (hebasta)
         - News and announcements are now displayed in Safari (fixes #208). (hebasta)