chore: update CHANGELOG

CHANGELOG.md

@@ -6,7 +6,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## Unreleased
+## [1.3.1] 2024-03-13
 
 ### Added
 
@@ -350,7 +350,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Deprecated mock contracts
 
 <!-- markdownlint-disable MD053 -->
-[Unreleased]: https://github.com/cartesi/rollups-node/releases/tag/v1.3.0...HEAD
+[Unreleased]: https://github.com/cartesi/rollups-node/releases/tag/v1.3.1...HEAD
+[1.3.1]: https://github.com/cartesi/rollups-node/releases/tag/v1.3.1
 [1.3.0]: https://github.com/cartesi/rollups-node/releases/tag/v1.3.0
 [1.2.0]: https://github.com/cartesi/rollups-node/releases/tag/v1.2.0
 [1.1.0]: https://github.com/cartesi/rollups-node/releases/tag/v1.1.0