message: Update CHANGELOG for stargate default gas exports
diff: @@ -48,6 +48,7 @@ and this project adheres to
  transaction signed by a multisig account.
  - @cosmjs/stargate: Add `delegateTokens`, `undelegateTokens` and
  `withdrawRewards` methods to `SigningStargateClient`.
  +- @cosmjs/stargate: Export `defaultGasLimits` and `defaultGasPrice`.
  ### Changed
  