Update CHANGELOG

CHANGELOG.md

@@ -17,6 +17,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed ###
 
+* [#104](https://gitlab.com/linkahead/linkahead-pylib/-/issues/104) Selecting
+  parts of a `Container` with a `slice` used to return a `list` object instead
+  of a `Container`, removing all useful methods of the `Container` class. This
+  has been fixed and using a `slice` such as `[:2]` now returns a new
+  `Container`.
+
 ### Security ###
 
 ### Documentation ###