message: Add missing links to CHANGELOG [ci skip]
diff: @@ -1120,7 +1120,9 @@ Some main points:
  All future Changelog entries will reference this base
  -[unreleased]: https://github.com/CosmWasm/cosmwasm/compare/v0.16.0...HEAD
  +[unreleased]: https://github.com/CosmWasm/cosmwasm/compare/v0.16.2...HEAD
  +[0.16.2]: https://github.com/CosmWasm/cosmwasm/compare/v0.16.1...v0.16.2
  +[0.16.1]: https://github.com/CosmWasm/cosmwasm/compare/v0.16.0...v0.16.1
  [0.16.0]: https://github.com/CosmWasm/cosmwasm/compare/v0.15.2...v0.16.0
  [0.15.2]: https://github.com/CosmWasm/cosmwasm/compare/v0.15.1...v0.15.2
  [0.15.1]: https://github.com/CosmWasm/cosmwasm/compare/v0.15.0...v0.15.1
  