Update README.md

README.md

@@ -109,7 +109,7 @@ model.predict()
 from ultralytics import YOLO
 
 model = YOLO('yolov12{n/s/m/l/x}.pt')
-model.export(...)
+model.export(format="engine", half=True)  # or ONNX format
 ```
 
 ## Demo