message: Update CHANGELOG with addition of std::iter::Sum for Decimal
diff: @@ -14,6 +14,7 @@ and this project adheres to
  - cosmwasm-vm: The default `singlepass` compiler is now supported on 64-bit
  Windows.
  - cosmwasm-std: Add missing `DivideByZeroError` export.
  +- cosmwasm-std: Implementation of `std::iter::Sum` for `Decimal`.
  ### Changed
  