Update CHANGELOG

Author: pboivin

CHANGELOG.md

@@ -1,10 +1,20 @@
 # Release Notes
 
-## [unreleased](https://github.com/pboivin/flou/compare/v1.2.0...main) - next
+## [v1.3.0](https://github.com/pboivin/flou/compare/v1.3.0...main) - 2022-09-01
 
 #### Added
 
-- Add shortcut for single image widths configuration (`ImageSet`)
+- Add shortcut for single image widths (`ImageSet`)
+- Add new configuration format for art-directed images (`ImageSet`)
+- Add integration test
+
+#### Changed
+
+- Refactor ImageSet internal data representation. Impacts `data()` and `toArray()` return values. (`ImageSet`)
+
+#### Chores
+
+- Update README examples
 
 
 ## [v1.2.0](https://github.com/pboivin/flou/compare/v1.1.0...v1.2.0) - 2022-08-24