message: add to changlog
diff: @@ -33,11 +33,15 @@ and this project adheres to
  ([#1561]).
  - cosmwasm-vm: Add `Cache::remove_wasm` to remove obsolete Wasm blobs and their
  compiled modules.
  +- cosmwasm-std: Implement fraction multiplication and division. Assists with
  + Uint & Decimal arithmetic and exposes methods for flooring/ceiling result
  + ([#1485], [#1566]).
  [#1436]: https://github.com/CosmWasm/cosmwasm/issues/1436
  [#1437]: https://github.com/CosmWasm/cosmwasm/issues/1437
  -[#1481]: https://github.com/CosmWasm/cosmwasm/pull/1481
  [#1478]: https://github.com/CosmWasm/cosmwasm/pull/1478
  +[#1481]: https://github.com/CosmWasm/cosmwasm/pull/1481
  +[#1485]: https://github.com/CosmWasm/cosmwasm/issues/1485
  [#1513]: https://github.com/CosmWasm/cosmwasm/pull/1513
  [#1533]: https://github.com/CosmWasm/cosmwasm/pull/1533
  [#1550]: https://github.com/CosmWasm/cosmwasm/issues/1550
  @@ -45,6 +49,7 @@ and this project adheres to
  [#1554]: https://github.com/CosmWasm/cosmwasm/pull/1554
  [#1560]: https://github.com/CosmWasm/cosmwasm/pull/1560
  [#1561]: https://github.com/CosmWasm/cosmwasm/pull/1561
  +[#1566]: https://github.com/CosmWasm/cosmwasm/pull/1566
  ### Changed
  