Add PR ID to CHANGELOG

Author: marc-farre

docs/CHANGELOG.md

@@ -5,7 +5,7 @@ Changelog
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 - Fix #75: Warning for "FCM Detection - App is using Proxy Firebase Service"
 - Fix #78: Don't show opener if logout triggered by mobile app
-- Enh: Migration to Bootstrap 5 for HumHub 1.18
+- Enh #79: Migration to Bootstrap 5 for HumHub 1.18
 
 2.1.8 (March 21, 2025)
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