Update CHANGELOG.md for release 6.6.3
@@ -8,6 +8,8 @@ Versioning](http://semver.org/spec/v2.0.0.html).
## Unreleased
+## [6.6.3] - 2021-12-15
+
### Added
- Added `etcd-client-log-level` configuration flag for setting the log level of
the etcd client used internally within sensu-backend.
