Add a changelog and update it for this PR
# Unreleased
+ - [#622](https://github.com/kubernetes-sigs/federation-v2/pull/622) -
+ Switched the sync controller to using a new finalizer
+ (`federation.k8s.io/sync-controller` instead of
+ `federation.kubernetes.io/delete-from-underlying-clusters`) and
+ replaced the use of the kube `orphan` finalizer in favor of an
+ annotation to avoid conflicting with the garbage collector. This
+ change in finalizer usage represents a breaking change since
+ resources reconciled by previous versions of the sync controller
+ will have the old finalizer. The old finalizer would need to be
+ manually removed from a resource for that resource to be garbage
+ collected after deletion.
- [#698](https://github.com/kubernetes-sigs/federation-v2/pull/698) -
Fix the generated CRD schema of scalable resources to define the
`retainReplicas` of type `boolean` rather than the invalid type
