message: Update CHANGELOG for stargate encode objects
diff: @@ -75,6 +75,10 @@ and this project adheres to
  now include `gasUsed` and `gasWanted` properties.
  - @cosmjs/proto-signing: Export `DecodeObject` and `TxBodyEncodeObject`
  interfaces as well as `isTxBodyEncodeObject` helper function.
  +- @cosmjs/stargate: Add `MsgDelegateEncodeObject`, `MsgSendEncodeObject`,
  + `MsgTransferEncodeObject`, `MsgUndelegateEncodeObject` and
  + `MsgWithdrawDelegatorRewardEncodeObject` interfaces as well as
  + `isMsgDelegateEncodeObject` etc helpers.
  ### Changed
  