Fix tests

Author: tomas-novotny

CHANGELOG.md

@@ -6,8 +6,20 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 
-## [Unreleased](https://github.com/gravitton/errors/compare/v1.0.0...master)
+## [Unreleased](https://github.com/gravitton/errors/compare/v1.1.0...master)
 
+## 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`
+- `MultiError` mutex upgraded to `sync.RWMutex` for improved read concurrency
+- `MultiError.ErrorOrNil` and `Unwrap` now handle nil receiver safely
+- `MultiError.Error` and `GoString` are now concurrency-safe
 
 ## v1.0.0 (2025-10-17)
 ### Added

README.md

@@ -49,8 +49,8 @@ import (
 func Process() error {
 	errs := errors.NewMulti()
 
-    errs.Append(process(1))
-    errs.Append(process(2))
+    errs.Add(process(1))
+    errs.Add(process(2))
 
 	return errs.ErrorOrNil()
 }
@@ -65,7 +65,7 @@ func ProcessConcurrent() error {
 			defer wg.Done()
 
 			if err := process(i); err != nil {
-				errs.Append(errors.Wrap(err).WithField("process", i))
+				errs.Add(errors.Wrap(err).WithField("process", i))
 			}
 		}(i)
 	}