chore: changelog

Author: jaybuidl

contracts/CHANGELOG.md

@@ -8,6 +8,7 @@ The format is based on [Common Changelog](https://common-changelog.org/).
 
 ### Changed
 
+- **Breaking:** Replace `require()` with `revert()` and custom errors outside KlerosCore for consistency and smaller bytecode ([#2084](https://github.com/kleros/kleros-v2/issues/2084))
 - Set the Hardhat Solidity version to v0.8.30 and enable the IR pipeline ([#2069](https://github.com/kleros/kleros-v2/issues/2069))
 - Set the Foundry Solidity version to v0.8.30 and enable the IR pipeline ([#2073](https://github.com/kleros/kleros-v2/issues/2073))
 - Widen the allowed solc version to any v0.8.x for the interfaces only ([#2083](https://github.com/kleros/kleros-v2/issues/2083))