message: Update CHANGELOG for ibc codecs
diff: @@ -18,6 +18,8 @@ and this project adheres to
  and `StargateClient`. Added `ModuleAccount` and vesting accounts
  `BaseVestingAccount`, `ContinuousVestingAccount`, `DelayedVestingAccount` and
  `PeriodicVestingAccount`.
  +- @cosmjs/stargate: Add codecs for IBC channel tx, client query/tx, and
  + connection tx.
  ### Changed
  