bug fix #30

weights/download_weights.sh

 #!/bin/bash
 # Download common models
 
-python3 -c "from models import *;
+python3 -c "from utils.google_utils import *;
 attempt_download('weights/yolov5s.pt');
 attempt_download('weights/yolov5m.pt');
 attempt_download('weights/yolov5l.pt')"