fix changelog merge conflict

Author: Trivo25

CHANGELOG.md

@@ -24,6 +24,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Add `enforceTransactionLimits` parameter on Network https://github.com/o1-labs/o1js/issues/1910
 - Method for optional types to assert none https://github.com/o1-labs/o1js/pull/1922
 - Increased maximum supported amount of methods in a `SmartContract` or `ZkProgram` to 30. https://github.com/o1-labs/o1js/pull/1918
+- Expose low-level conversion methods `Proof.{_proofToBase64,_proofFromBase64}` https://github.com/o1-labs/o1js/pull/1928
 
 ### Fixed