[CHANGELOG] Add entry for xcfilelist

CHANGELOG.md

@@ -83,7 +83,12 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
 
 * Slightly improve resolution speed for Podfiles that contain multiple targets
   with the same dependencies.  
-  [Samuel Giddins]
+  [Samuel Giddins](https://github.com/segiddins)
+
+* Use `xcfilelist`s for script phase input & output paths, to reduce churn in
+  the user Xcode project and reduce the chance of hitting `ARG_MAX`.  
+  [Samuel Giddins](https://github.com/segiddins)
+  [#8037](https://github.com/CocoaPods/CocoaPods/issues/8037)
 
 ##### Bug Fixes