update changelog

Author: crodriguezvega

CHANGELOG.md

@@ -87,6 +87,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * (testing) [\#884](https://github.com/cosmos/ibc-go/pull/884) Add and use in simapp a custom ante handler that rejects redundant transactions
 * (transfer) [\#978](https://github.com/cosmos/ibc-go/pull/978) Support base denoms with slashes in denom validation
+* (client) [\#941](https://github.com/cosmos/ibc-go/pull/941) Classify client states without consensus states as expired
 
 ## [v2.0.2](https://github.com/cosmos/ibc-go/releases/tag/v2.0.2) - 2021-12-15