message: Add CHANGELOG entry for OverflowOperation::Shr
diff: @@ -41,6 +41,9 @@ and this project adheres to
  - cosmwasm-std: In `ExternalApi::addr_validate` and `::addr_canonicalize` do not
  send too long inputs to VM to avoid terminating contract execution. Errors are
  returned instead now.
  +- cosmwasm-std: Add enum cases `Shr` to `OverflowOperation` (breaking; [#1059]).
  +
  +[#1059]: https://github.com/CosmWasm/cosmwasm/pull/1059
  ## [0.16.0] - 2021-08-05
  