docs: add changelog entry

Author: DannyvdSluijs

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 ### Fixed
 - Fix objects are non-unique despite key order ([#819](https://github.com/jsonrainbow/json-schema/pull/819))
+- Id's not being resolved and id property affects sibling ref which it should not do ([#828](https://github.com/jsonrainbow/json-schema/pull/828)) 
 
 ### Changed
 - Added extra breaking change to UPDATE-6.0.md regarding BaseConstraint::addError signature change ([#823](https://github.com/jsonrainbow/json-schema/pull/823))