add changelog entry

Author: colin-axner

CHANGELOG.md

@@ -64,6 +64,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### State Machine Breaking
 
+* (apps/transfer) [\#1907](https://github.com/cosmos/ibc-go/pull/1907) Blocked module account addresses are no longer allowed to send IBC transfers. 
 * (apps/27-interchain-accounts) [\#1882](https://github.com/cosmos/ibc-go/pull/1882) Explicitly check length of interchain account packet data in favour of nil check.
 
 ### Improvements