chore: update CHANGELOG.md

Author: Aditi3

CHANGELOG.md

@@ -1,4 +1,5 @@
-### Version 5.0.2 (28th January 2025)
+### Version 5.1.0 (28th January 2025)
+
 #### Added
 - Added `jsonResponse` field (`NSDictionary`) to `ADJAttribution` where every key-value pair sent by the backend as part of the attribution response can be found. Equivalently, one can also find `jsonResponse` map being part of the attribution instance in the web bridge API.