Point people to the upgrade notes. v1.26.0rc1

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diff --git a/CHANGES.md b/CHANGES.md

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 Synapse 1.26.0rc1 (2021-01-20)
 ==============================
 
+This release brings a new schema version for Synapse and rolling back to a previous
+verious is not trivial.  Please review [UPGRADE.rst](UPGRADE.rst) for more details
+on these changes  and for general upgrade guidance.
+
 Features
 --------