Update update.md

Author: 1038lab

update.md

@@ -1,5 +1,19 @@
 # ComfyUI-RMBG Update Log
 
+## v1.9.2 (2025/02/21)
+### New Features
+- Added Fast Foreground Color Estimation feature
+  - New `refine_foreground` option for optimizing transparent backgrounds
+  - Improved edge quality and detail preservation
+  - Better handling of semi-transparent regions
+![RMBG_V1 9 2](https://github.com/user-attachments/assets/aaf51bff-931b-47ef-b20b-0dabddc49873)
+
+### Technical Improvements
+- Added OpenCV dependency for advanced image processing
+- Enhanced foreground refinement algorithm
+- Optimized memory usage for large images
+- Improved edge detection accuracy
+
 ## v1.9.1 (2025/02/20)
 ### Technical Updates
 - Changed repository for model management to the new repository