Update CHANGELOG.md

Co-authored-by: Amaury <1293565+amaurym@users.noreply.github.com>

CHANGELOG.md

@@ -43,16 +43,6 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Improvements
 
 * (store) [\#9403](https://github.com/cosmos/cosmos-sdk/pull/9403) Add `RefundGas` function to `GasMeter` interface
-* (baseapp, types) [\#9390](https://github.com/cosmos/cosmos-sdk/pull/9390) Add current block header hash to `Context`
-* (x/staking) [\#9423](https://github.com/cosmos/cosmos-sdk/pull/9423) Staking delegations now returns empty list instead of rpc error when no records found.
-* (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
-* (crypto/types) [\#8600](https://github.com/cosmos/cosmos-sdk/pull/8600) `CompactBitArray`: optimize the `NumTrueBitsBefore` method and add an `Equal` method.
-* (x/upgrade) [\#8743](https://github.com/cosmos/cosmos-sdk/pull/8743) Add tracking module versions as per ADR-041
-* (types) [\#8962](https://github.com/cosmos/cosmos-sdk/issues/8962) Add `Abs()` method to `sdk.Int`.
-* (x/bank) [\#8950](https://github.com/cosmos/cosmos-sdk/pull/8950) Improve efficiency on supply updates.
-* (store) [\#8012](https://github.com/cosmos/cosmos-sdk/pull/8012) Implementation of ADR-038 WriteListener and listen.KVStore
-* (makefile) [\#7933](https://github.com/cosmos/cosmos-sdk/issues/7933) Use Docker to generate swagger files.
 
 ## [v0.42.5](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.42.5) - 2021-05-18