Update UPDATING.md (apache#4348)

[AIRFLOW-XXX] Add section to Updating.md regarding timezones
TiDeane · Dec 26, 2018 · fb52d7b · fb52d7b
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diff --git a/UPDATING.md b/UPDATING.md
@@ -202,6 +202,7 @@ There are five roles created for Airflow by default: Admin, User, Op, Viewer, an
 - All ModelViews in Flask-AppBuilder follow a different pattern from Flask-Admin. The `/admin` part of the URL path will no longer exist. For example: `/admin/connection` becomes `/connection/list`, `/admin/connection/new` becomes `/connection/add`, `/admin/connection/edit` becomes `/connection/edit`, etc.
 - Due to security concerns, the new webserver will no longer support the features in the `Data Profiling` menu of old UI, including `Ad Hoc Query`, `Charts`, and `Known Events`.
 - HiveServer2Hook.get_results() always returns a list of tuples, even when a single column is queried, as per Python API 2.
+- **UTC is now the default timezone**: Either reconfigure your workflows scheduling in UTC or set `default_timezone` as explained in https://airflow.apache.org/timezone.html#default-time-zone 
 
 ### airflow.contrib.sensors.hdfs_sensors renamed to airflow.contrib.sensors.hdfs_sensor