Update CHANGELOG.md to reflect recent additions

Author: DjangoCRM

CHANGELOG.md

@@ -14,7 +14,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Added the fields `region` ("Region/State") and `district` ("District/County"):
   - to the models Company, Contact and Lead by @Tosinibikunle in #262
-  - to the `fieldsets` of `CompanyAdmin` by @summer1220 in #265
+  - to the `CompanyAdmin` by @summer1220 in #265
+  - to the `LeadAdmin` by @Faria-Shahid in #276
+- Added the `case` field:
+  - to the Request model by @iclectic in #273
+  - to the `RequestAdmin` by @souhil25 in #278
 
 ## [1.5.2] - 2025-08-16