update reference yolov5 commit (#237)

Author: fcakyon

README.md

@@ -25,7 +25,7 @@ You can finally install <a href="https://github.com/ultralytics/yolov5">YOLOv5 o
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-This yolov5 package contains everything from ultralytics/yolov5 <a href="https://github.com/ultralytics/yolov5/tree/064365d8683fd002e9ad789c1e91fa3d021b44f0">at this commit</a> plus:
+This yolov5 package contains everything from ultralytics/yolov5 <a href="https://github.com/ultralytics/yolov5/tree/5deff1471dede726f6399be43e7073ee7ed3a7d4">at this commit</a> plus:
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 1. Easy installation via pip: <b>pip install yolov5</b>
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