Update releases.md

Author: ivder

releases.md

@@ -1,5 +1,10 @@
 # HISPlayer Unity iOS SDK Release Notes
 
+### Version 4.15.0
+##### January 21, 2026
+- [**Added**] Windows editor supports Direct3D12 Graphics API and Auto Graphics API in Unity6.
+- [**Improvement**] Optimized HISPLAYER_EVENT_PLAYBACK_SEEK_END and EventPlaybackSeekEnd for Windows editor.
+
 ### Version 4.14.5
 ##### January 15, 2026
 - [**Improvement**] Updated param1 of EventVolumeChange to return the correct volume value.