Update CHANGELOG.md

Author: tspiller

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -13,6 +13,7 @@ however, it has to be formatted properly to pass verification tests.
 ### Fixed
 - Fixed an issue where all action maps were enabled initially for project wide actions, which overrode the PlayerInput action map configuration. [ISXB-920](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-920)
 - Fixed an issue where ButtonStates are not fully updated when switching SingleUnifiedPointer. [ISXB-1356](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1356)
+- Fixed errors when pasting composite parts into non-composites. [ISXB-757](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-757)
 
 ### Changed
 - Changed enum value `Key.IMESelected` to obsolete which was not a real key. Please use the ButtonControl `imeSelected`.