Update CHANGELOG.md

Author: TylerWitt

CHANGELOG.md

@@ -1,9 +1,15 @@
 # 1.28.0
 
+### Enhancements
+
 * Allow `auto_start_producers` and `allow_topic_auto_creation` to be configurable for brod clients. If configuration of either of these values is desired, update your producer or consumer configs.
 
 * Add `Kaffe.MessageHandler` behaviour. To utilize it, add the behaviour to your configured `message_handler` and `@impl Kaffe.MessageHandler` on `handle_messages/1`.
 
+### Fixes
+
+* Stops compiler warnings on duplciate doc definitions
+
 # 1.27.2
 
 * Relax `:retry` requirement