Update README.md

Fix  ultralytics<=8.2.103

yolov8/README.md

@@ -17,18 +17,14 @@ The tensorrt code is derived from [xiaocao-tian/yolov8_tensorrt](https://github.
 
 - TensorRT 8.0+
 - OpenCV 3.4.0+
+- ultralytics<=8.2.103
 
 ## Different versions of yolov8
 
 Currently, we support yolov8
 
 - For yolov8 , download .pt from [https://github.com/ultralytics/assets/releases](https://github.com/ultralytics/assets/releases), then follow how-to-run in current page.
 
-## Custom models
-
-- Use ultralytics<=8.2.103 for training.
-- Update kNumClass in [include/config.h](./include/config.h) to the number of classes in the custom model
-
 ## Config
 
 - Choose the model n/s/m/l/x/n2/s2/m2/l2/x2/n6/s6/m6/l6/x6 from command line arguments.