feat: updated changelog

Author: Matt561

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- update **post-relay-subsidy-balance** schedule to run at 11:53 and 23:53 UTC ([#212](https://github.com/MetaMask/github-tools/pull/212))
+
 ### Added
 
 - Add workflow **post-relay-subsidy-balance** to post Relay subsidy balance reports to Slack ([#211](https://github.com/MetaMask/github-tools/pull/211))