Update CHANGELOG

CHANGELOG.md

@@ -1,5 +1,37 @@
 # What's new
 
+## v3.29.1
+
+__Fixes__
+
+- Fix undefined referencein markQualifyingEventsAsComplete
+
+__Server upgrade instructions__
+
+Reminder: Consider using the [Tangerine Upgrade Checklist](https://docs.tangerinecentral.org/system-administrator/upgrade-checklist.html) for making sure you test the upgrade safely.
+
+```
+cd tangerine
+# Check the size of the data folder.
+du -sh data
+# Check disk for free space. 
+df -h
+# If there is not more than 12 GB plus the size of the data folder, create more space before proceeding. 
+# Good candidates to remove are: data back-up folders and older versions of the Tangerine image
+# rm -rf ../data-backup-<date>
+# docker rmi tangerine/tangerine:<version>
+# Create a backup of the data folder.
+cp -r data ../data-backup-$(date "+%F-%T")
+# Check logs for the past hour on the server to ensure it's not being actively used. Look for log messages like "Created sync session" for Devices that are syncing and "login success" for users logging in on the server. 
+docker logs --since=60m tangerine
+# Fetch the updates.
+git fetch origin
+git checkout -b v3.29.1 v3.29.1
+./start.sh v3.29.1
+# Remove Tangerine's previous version Docker Image.
+docker rmi tangerine/tangerine:<previous_version>
+```
+
 ## v3.29.0
 
 __New Features__