message: Update CHANGELOG for IBC query/signing client
diff: @@ -19,7 +19,9 @@ and this project adheres to
  `BaseVestingAccount`, `ContinuousVestingAccount`, `DelayedVestingAccount` and
  `PeriodicVestingAccount`.
  - @cosmjs/stargate: Add codecs for IBC channel tx, client query/tx, and
  - connection tx.
  + connection tx, as well as Tendermint.
  +- @cosmjs/stargate: Add support for IBC message types in
  + `SigningStargateClient`.
  ### Changed
  @@ -31,6 +33,8 @@ and this project adheres to
  - @cosmjs/stargate: Remove `accountFromProto` in favour of `accountFromAny`.
  - @cosmjs/stargate: Rename `Rpc` interface to `ProtobufRpcClient` and
  `createRpc` to `createProtobufRpcClient`.
  +- @cosmjs/stargate: Reorganize nesting structure of IBC query client and add
  + support for more methods.
  - @cosmjs/tendermint-rpc: The fields `CommitSignature.validatorAddress`,
  `.timestamp` and `.signature` are now optional. They are unset when
  `blockIdFlag` is `BlockIdFlag.Absent`. The decoding into `CommitSignature` is
  