message: Adapt CHANGELOG entry and add follow-up PR link
diff: @@ -23,7 +23,8 @@ and this project adheres to
  - cosmwasm-std: Upgrade `serde-json-wasm` dependency to 0.5.0 which adds map
  support to `to_vec`/`to_binary` and friends.
  - cosmwasm-std: Implement `AsRef<[u8]>` for `Binary` and `HexBinary` ([#1550]).
  -- cosmwasm-std: Add constructor `SupplyResponse::new` ([#1552]).
  +- cosmwasm-std: Allow constructing `SupplyResponse` via a `Default`
  + implementation ([#1552], [#1560]).
  [#1436]: https://github.com/CosmWasm/cosmwasm/issues/1436
  [#1437]: https://github.com/CosmWasm/cosmwasm/issues/1437
  @@ -33,6 +34,7 @@ and this project adheres to
  [#1550]: https://github.com/CosmWasm/cosmwasm/issues/1550
  [#1552]: https://github.com/CosmWasm/cosmwasm/pull/1552
  [#1554]: https://github.com/CosmWasm/cosmwasm/pull/1554
  +[#1560]: https://github.com/CosmWasm/cosmwasm/pull/1560
  ### Changed
  