message: Add missing assertIsBroadcastTxSuccess CHANGELOG entry [skip ci]
  Closes
diff: @@ -150,6 +150,10 @@ and this project adheres to
  object. ([#928])
  - @cosmjs/stargate and @cosmjs/cosmwasm-stargate: Add simulation support
  ([#931]).
  +- @cosmjs/cosmwasm-stargate: Rename `BroadcastTx{Success,Failure}` to
  + `DeliverTx{Success,Failure}`, `BroadcastTxResponse` to `DeliverTxResponse`,
  + `isBroadcastTx{Success,Failure}` to `isDeliverTx{Success,Failure}` and
  + `assertIsBroadcastTxSuccess` to `assertIsDeliverTxSuccess`. ([#946])
  - @cosmjs/tendermint-rpc: Remove `Tendermint33Client` and related symbols.
  - @cosmjs/cosmwasm-stargate: Add support for wasmd 0.21. This changes the AMINO
  JSON representation of `Msg{Execute,Instantiate,Migrate}Contract.msg` from
  @@ -162,6 +166,7 @@ and this project adheres to
  [#928]: https://github.com/cosmos/cosmjs/issues/928
  [#931]: https://github.com/cosmos/cosmjs/pull/931
  [#709]: https://github.com/cosmos/cosmjs/issues/709
  +[#946]: https://github.com/cosmos/cosmjs/pull/946
  [#948]: https://github.com/cosmos/cosmjs/pull/948
  ## [0.26.6] - 2022-01-10
  