[unity] Updated changelog to modifications of commit 4a684f6 (skin API changes, removed extension methods).

CHANGELOG.md

@@ -38,7 +38,10 @@
 * **Breaking changes**
   * **Removed PoseSkeleton() and PoseWithAnimation()** extension methods to prevent issues where animations are not mixed out. Problem was that these methods did not set AnimationState, leaving incorrect state at e.g. attachments enabled at slots when starting subsequent animations. As a replacement you can use `AnimationState.ClearTrack(0);` followed by `var entry = AnimationState.SetAnimation(0, animation, loop); entry.TrackTime = time` to achieve similar behaviour.
   * **The `Shadow alpha cutoff` shader parameter is now respecting slot-color alpha** values at all Spine shaders. A fragment's texture color alpha is multiplied with slot-color alpha before the result is tested against the `Shadow alpha cutoff` threshold.
-
+  * **Removed redundant `Attachment.GetClone()` and `MeshAttachment.GetLinkedClone()` extension methods**. Use methods `Attachment.Copy` and `MeshAttachment.NewLinkedMesh()` instead.
+  * **Renamed extension method `Attachment.GetClone(bool cloneMeshesAsLinked)` to `Attachment.GetCopy(bool cloneMeshesAsLinked)`** to follow the naming scheme of the Spine API.
+  * **Changed `MeshAttachment.GetLinkedMesh()` method signatures:** removed optional parameters `bool inheritDeform = true, bool copyOriginalProperties = false`.
+  
 * **Additions**
   * **Spine Preferences stored in Assets/Editor/SpineSettings.asset** Now Spine uses the new `SettingsProvider` API, storing settings in a SpineSettings.asset file which can be shared with team members. Your old preferences are automatically migrated to the new system.