chore: Update CHANGELOG with 0.42.5 and 0.42.6 (#9558)

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## Description

0.42.5 and 0.42.6 have both been released. This PR forward-ports the Changelog updates to master.

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---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [x] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [x] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [x] reviewed "Files changed" and left comments if necessary
- [x] confirmed all CI checks have passed

### Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

CHANGELOG.md

@@ -38,11 +38,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * [\#9540](https://github.com/cosmos/cosmos-sdk/pull/9540) Add output flag for query txs command.
 * [\#9460](https://github.com/cosmos/cosmos-sdk/pull/9460) Fix lint error in `MigratePrefixAddress`.
-* [\#9428](https://github.com/cosmos/cosmos-sdk/pull/9428) Optimize bank InitGenesis. Removed bank keeper's `k.setBalances` and `k.clearBalances`. Added `k.initBalances`.
 * [\#9231](https://github.com/cosmos/cosmos-sdk/pull/9231) Remove redundant staking errors.
 * [\#9205](https://github.com/cosmos/cosmos-sdk/pull/9205) Improve readability in `abci` handleQueryP2P
-* [\#9235](https://github.com/cosmos/cosmos-sdk/pull/9235) CreateMembershipProof/CreateNonMembershipProof now returns an error
-if input key is empty, or input data contains empty key.
 * [\#9314](https://github.com/cosmos/cosmos-sdk/pull/9314) Update Rosetta SDK to upstream's latest release.
 
 ### Features
@@ -57,7 +54,6 @@ if input key is empty, or input data contains empty key.
 * [\#9133](https://github.com/cosmos/cosmos-sdk/pull/9133) Added hooks for governance actions.
 * (x/staking) [\#9214](https://github.com/cosmos/cosmos-sdk/pull/9214) Added `new_shares` attribute inside `EventTypeDelegate` event.
 * [\#9382](https://github.com/cosmos/cosmos-sdk/pull/9382) feat: add Dec.Float64() function.
-* [\#9429](https://github.com/cosmos/cosmos-sdk/pull/9429) Add `cosmos_sdk_version` to node_info
 * [\#9457](https://github.com/cosmos/cosmos-sdk/pull/9457) Add amino support for x/authz and x/feegrant Msgs.
 * [\#9498](https://github.com/cosmos/cosmos-sdk/pull/9498) Added `Codec: codec.Codec` attribute to `client/Context` structure.
 
@@ -135,8 +131,6 @@ if input key is empty, or input data contains empty key.
 
 * (gRPC-Web) [\#9493](https://github.com/cosmos/cosmos-sdk/pull/9493) Add `EnableUnsafeCORS` flag to grpc-web config.
 * (x/params) [\#9481](https://github.com/cosmos/cosmos-sdk/issues/9481) Speedup simulator for parameter change proposals.
-* (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
@@ -149,7 +143,6 @@ if input key is empty, or input data contains empty key.
 
 ### Bug Fixes
 
-* [\#9514](https://github.com/cosmos/cosmos-sdk/issues/9514) Fix panic when retrieving the `BlockGasMeter` on `(Re)CheckTx` mode.
 * [\#9454](https://github.com/cosmos/cosmos-sdk/pull/9454) Fix testnet command with --node-dir-prefix accepts `-` and change `node-dir-prefix token` to `testtoken`.
 * (x/gov) [\#8813](https://github.com/cosmos/cosmos-sdk/pull/8813) fix `GET /cosmos/gov/v1beta1/proposals/{proposal_id}/deposits` to include initial deposit
 * (gRPC) [\#8945](https://github.com/cosmos/cosmos-sdk/pull/8945) gRPC reflection now works correctly.
@@ -164,6 +157,42 @@ if input key is empty, or input data contains empty key.
 * (grpc) [\#8926](https://github.com/cosmos/cosmos-sdk/pull/8926) The `tx` field in `SimulateRequest` has been deprecated, prefer to pass `tx_bytes` instead.
 * (sdk types) [\#9498](https://github.com/cosmos/cosmos-sdk/pull/9498) `clientContext.JSONCodec` will be removed in the next version. use `clientContext.Codec` instead.
 
+## [v0.42.6](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.42.6) - 2021-06-18
+
+### Improvements
+
+* [\#9428](https://github.com/cosmos/cosmos-sdk/pull/9428) Optimize bank InitGenesis. Added `k.initBalances`.
+* [\#9429](https://github.com/cosmos/cosmos-sdk/pull/9429) Add `cosmos_sdk_version` to node_info
+* [\#9541](https://github.com/cosmos/cosmos-sdk/pull/9541) Bump tendermint dependency to v0.34.11.
+
+### Bug Fixes
+
+* [\#9385](https://github.com/cosmos/cosmos-sdk/pull/9385) Fix IBC `query ibc client header` cli command. Support historical queries for query header/node-state commands.
+* [\#9401](https://github.com/cosmos/cosmos-sdk/pull/9401) Fixes incorrect export of IBC identifier sequences. Previously, the next identifier sequence for clients/connections/channels was not set during genesis export. This resulted in the next identifiers being generated on the new chain to reuse old identifiers (the sequences began again from 0).
+* [\#9408](https://github.com/cosmos/cosmos-sdk/pull/9408) Update simapp to use correct default broadcast mode.
+* [\#9513](https://github.com/cosmos/cosmos-sdk/pull/9513) Fixes testnet CLI command. Testnet now updates the supply in genesis. Previously, when using add-genesis-account and testnet together, inconsistent genesis files would be produced, as only add-genesis-account was updating the supply.
+* (x/gov) [\#8813](https://github.com/cosmos/cosmos-sdk/pull/8813) fix `GET /cosmos/gov/v1beta1/proposals/{proposal_id}/deposits` to include initial deposit
+
+### Features
+
+* [\#9383](https://github.com/cosmos/cosmos-sdk/pull/9383) New CLI command `query ibc-transfer escrow-address <port> <channel id>` to get the escrow address for a channel; can be used to then query balance of escrowed tokens
+* (baseapp, types) [#\9390](https://github.com/cosmos/cosmos-sdk/pull/9390) Add current block header hash to `Context`
+* (store) [\#9403](https://github.com/cosmos/cosmos-sdk/pull/9403) Add `RefundGas` function to `GasMeter` interface
+
+## [v0.42.5](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.42.5) - 2021-05-18
+
+### Bug Fixes
+
+* [\#9514](https://github.com/cosmos/cosmos-sdk/issues/9514) Fix panic when retrieving the `BlockGasMeter` on `(Re)CheckTx` mode.
+* [\#9235](https://github.com/cosmos/cosmos-sdk/pull/9235) CreateMembershipProof/CreateNonMembershipProof now returns an error
+if input key is empty, or input data contains empty key.
+* [\#9108](https://github.com/cosmos/cosmos-sdk/pull/9108) Fixed the bug with querying multisig account, which is not showing threshold and public_keys.
+* [\#9345](https://github.com/cosmos/cosmos-sdk/pull/9345) Fix ARM support.
+* [\#9040](https://github.com/cosmos/cosmos-sdk/pull/9040) Fix ENV variables binding to CLI flags for client config.
+
+### Features
+
+* [\#8953](https://github.com/cosmos/cosmos-sdk/pull/8953) Add the `config` CLI subcommand back to the SDK, which saves client-side configuration in a `client.toml` file.
 
 ## [v0.42.4](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.42.4) - 2021-04-08