CHANGELOG.md in mad_flatter-3.0.3 vs CHANGELOG.md in mad_flatter-3.0.4

@@ -1,4 +1,11 @@
+### 3.0.4 [2023-12-02]
+
+Changes
+
+- Update ruby gems.
+- DRY up spec shared examples.
+
 ### 3.0.3 [2023-12-02]
 
 Changes
 
 - Update ruby gems.