Add Changelog entry

CHANGELOG.md

@@ -39,6 +39,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [v6.0.0](https://github.com/osmosis-labs/osmosis/releases/tag/v6.0.0)
+
+This upgrade fixes a bug in the v5.0.0 upgrade's app.go, which prevents new IBC channels from being created.
+This binary is compatible with v5.0.0 until block height `2464000`, estimated to be at 4PM UTC Monday December 20th.
+
+- [Patch](https://github.com/osmosis-labs/osmosis/commit/907001b08686ed980e0afa3d97a9c5e2f095b79f#diff-a172cedcae47474b615c54d510a5d84a8dea3032e958587430b413538be3f333) - Revert back to passing in the correct staking keeper into the IBC keeper constructor.
+- [Height gating change](https://github.com/osmosis-labs/ibc-go/pull/1) - Height gate the change in IBC, to make the v6.0.0 binary compatible until upgrade height.
+
 ## [v5.0.0](https://github.com/osmosis-labs/osmosis/releases/tag/v5.0.0) - Boron upgrade
 
 The Osmosis Boron release is made!