Changelog.md in merge_params-0.4.0 vs Changelog.md in merge_params-0.4.1

@@ -3,9 +3,13 @@
 This project follows [semver 2.0.0](http://semver.org/spec/v2.0.0.html) and the
 recommendations of [keepachangelog.com](http://keepachangelog.com/).
 
 ## (Unreleased)
 
+## 0.4.1 (2019-02-08)
+- Fix issue with merge_params not merging nested hashes as expected (changed to
+  use `deep_merge` instead of `merge`)
+
 ## 0.4.0 (2019-02-07)
 
 ### Added/Changed
 - Better support for nested hashes: Using `deep_symbolize_keys` instead of `symbolize_keys`.
 - Allow keys in nested hashes to be deleted by setting their value to nil