message: Update CHANGELOG for protected constructors
diff: @@ -50,6 +50,9 @@ and this project adheres to
  `withdrawRewards` methods to `SigningStargateClient`.
  - @cosmjs/stargate: Export `defaultGasLimits` and `defaultGasPrice`.
  - @cosmjs/cosmwasm-stargate: Export `defaultGasLimits`.
  +- @cosmjs/stargate: `SigningStargateClient` constructor is now `protected`.
  +- @cosmjs/cosmwasm-stargate: `SigningCosmWasmClient` constructor is now
  + `protected`.
  ### Changed
  