Changelog.md in merge_params-0.3.0 vs Changelog.md in merge_params-0.4.0

@@ -3,9 +3,17 @@
 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)
 
+## 0.4.0 (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
+- Add `params_from_url(url)` helper
+- Allow a hash to be passed as an argument to `params_for_url_for`
+- Add dependency on `facets` gem
 
 ## 0.3.0 (2019-01-24)
 
 ### Fixed
 - Fix `merge_url_for` to not try to add a param as a query param if it's been recognized as a route