chore: adding changelog entry

Author: chatton

CHANGELOG.md

@@ -69,6 +69,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### State Machine Breaking
 
 * (light-clients/07-tendermint) [\#2554](https://github.com/cosmos/ibc-go/pull/2554) Forbid negative values for `TrustingPeriod`, `UnbondingPeriod` and `MaxClockDrift` (as specified in ICS-07).
+* (06-solomachine) [\#2744](https://github.com/cosmos/ibc-go/pull/2744)  `Misbehaviour.ValidateBasic()` now only enforces that signature data does not match when the signature paths are different.
 
 ### Improvements