update CHANGELOG
avoids the doc-only commit
tip
===
+- [`fe7d976`](https://github.com/twmb/franz-go/commit/fe7d976): KIP-500 / KIP-631: add support for admin-level request DecommissionBroker
- [`ab66776`](https://github.com/twmb/franz-go/commit/ab66776): KIP-500 / KIP-631: add support for broker-only requests BrokerRegistration and BrokerHeartbeat
- [`31b1df7`](https://github.com/twmb/franz-go/commit/31b1df7): KIP-664: add support for DescribeProducers
- [`368bb21`](https://github.com/twmb/franz-go/commit/368bb21): **breaking kmsg protocol changes**: add support for KIP-516 CreateTopics and DeleteTopics bumps
