update CHANGELOG to remove x/ibc notions (#8863)

Co-authored-by: Alessio Treglia <[email protected]>

CHANGELOG.md

@@ -67,8 +67,6 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### State Machine Breaking
 
 * (x/{bank,distrib,gov,slashing,staking}) [\#8363](https://github.com/cosmos/cosmos-sdk/issues/8363) Store keys have been modified to allow for variable-length addresses.
-* (x/ibc) [\#8266](https://github.com/cosmos/cosmos-sdk/issues/8266) Add amino JSON for IBC messages in order to support Ledger text signing.
-* (x/ibc) [\#8405](https://github.com/cosmos/cosmos-sdk/pull/8405) Refactor IBC client update governance proposals to use a substitute client to update a frozen or expired client.
 * (x/evidence) [\#8502](https://github.com/cosmos/cosmos-sdk/pull/8502) `HandleEquivocationEvidence` persists the evidence to state.
 * (x/gov) [\#7733](https://github.com/cosmos/cosmos-sdk/pull/7733) ADR 037 Implementation: Governance Split Votes
 * (x/bank) [\#8656](https://github.com/cosmos/cosmos-sdk/pull/8656) balance and supply are now correctly tracked via `coin_spent`, `coin_received`, `coinbase` and `burn` events.
@@ -79,7 +77,6 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * (x/bank) [\#8614](https://github.com/cosmos/cosmos-sdk/issues/8614) Add `Name` and `Symbol` fields to denom metadata
 * (x/auth) [\#8522](https://github.com/cosmos/cosmos-sdk/pull/8522) Allow to query all stored accounts
-* (x/ibc) [\#7949](https://github.com/cosmos/cosmos-sdk/issues/7949) Standardized channel `Acknowledgement` moved to its own file. Codec registration redundancy removed.
 * (crypto/types) [\#8600](https://github.com/cosmos/cosmos-sdk/pull/8600) `CompactBitArray`: optimize the `NumTrueBitsBefore` method and add an `Equal` method.
 * (grpc) [\#8815](https://github.com/cosmos/cosmos-sdk/pull/8815) Add orderBy parameter to `TxsByEvents` endpoint.