message: Update CHANGELOG for removal of default fees
diff: @@ -24,6 +24,12 @@ and this project adheres to
  - @cosmjs/cosmwasm-stargate: The `transferAmount` property on
  `InstantiateOptions` (accepted as a parameter to
  `SigningCosmWasmClient.instantiate`) has been renamed to `funds`.
  +- @cosmjs/cosmwasm-stargate: Default fee/gas values have been removed. Fees now
  + need to be calculated and passed to `SigningCosmWasmClient` when calling any
  + methods which submit transactions to the blockchain.
  +- @cosmjs/stargate: Default fee/gas values have been removed. Fees now need to
  + be calculated and passed to `SigningStargateClient` when calling any methods
  + which submit transactions to the blockchain.
  - @cosmjs/tendermint-rpc: Make `tendermint34.Header.lastBlockId` and
  `tendermint34.Block.lastCommit` optional to better handle the case of height 1
  where there is no previous block.
  @@ -31,6 +37,11 @@ and this project adheres to
  ### Removed
  - Node.js v10 is no longer supported. Please use v12 or later.
  +- @cosmjs/cosmwasm-stargate: Remove `CosmWasmFeeTable` type and
  + `defaultGasLimits` object.
  +- @cosmjs/stargate: Remove types, objects and functions to do with default fees:
  + `CosmosFeeTable`, `FeeTable`, `GasLimits`, `defaultGasLimits`,
  + `defaultGasPrice` and `buildFeeTable`.
  - @cosmjs/tendermint-rpc: `Client` has been removed. Please use
  `Tendermint33Client` or `Tendermint34Client`, depending on your needs.
  