message: Update CHANGELOG for StargateClient.broadcastTx
diff: @@ -113,6 +113,9 @@ and this project adheres to
  a `Secp256k1HdWalletOptions` object.
  - @cosmjs/proto-signing: Options for `DirectSecp256k1HdWallet.fromMnemonic` are
  now passed via a `DirectSecp256k1HdWalletOptions` object.
  +- @cosmjs/stargate: `StargateClient.broadcastTx` now uses sync mode and then
  + polls for the transaction before resolving. The timeout and poll interval can
  + be configured.
  ### Deprecated
  