Update changelog with updates since 0.4.0 (#76)

CHANGELOG.md

@@ -5,6 +5,23 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 0.4.2 - 2021-05-09
+
+### Changed
+
+- Updates the exception thrown during compilation if a class annotated with an AsyncUnit Attribute cannot be loaded to 
+better inform the user what has happened.
+
+### Fixed
+
+- Fixes a bug where the inappropriate directory was used when executing the AsyncUnit executable from `vendor/bin`
+
+## 0.4.1 - 2021-05-09
+
+### Changed
+
+- Updates Labrador Core to 3.2.0
+
 ## 0.4.0 - 2021-05-09
 
 ### Added