Update CHANGELOG.md

Author: brianquinlan

pkgs/cupertino_http/CHANGELOG.md

@@ -1,7 +1,8 @@
 ## 2.4.0-wip
 
 * Switch to `package:objective_c` `8.1.0` and `package:ffigen` `19.1.0`.
-
+* Add URL to thrown `RequestAbortedException`.
+ 
 ## 2.3.0
 
 * Add the ability to abort requests.