Update changelog

Author: tomas-novotny

CHANGELOG.md

@@ -11,9 +11,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## v1.1.0 (2026-04-22)(https://github.com/gravitton/errors/compare/v1.0.0...v1.1.0)
 ### Added
 - `DataError` stack trace capture via `StackTrace()`
-- `DataError.Is` for sentinel matching with optional field scoping
-- `DataError.WithCause` for attaching a cause to the error chain
-- `DataError.GoString` for debugging output
 
 ### Changed
 - `MultiError.Append` renamed to `MultiError.Add`