Add changelog entry

Author: brendan-kellam

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- [**Breaking Change**] Added index schema v2. This new schema brings many quality of life features like clearer syntax, ability to specify individual `repos`, `projects`, `groups`, and `orgs`, and the ability to easily `exclude` repositories.
+
 ## [1.0.3] - 2024-10-15
 
 ### Fixed