Update README.md

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

README.md

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     <a href="http://www.ultralytics.com/blog/ultralytics-yolov8-turns-one-a-year-of-breakthroughs-and-innovations" target="_blank">
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+      <img width="100%" src="https://github.com/raw/ultralytics/assets/main/yolov8/banner-yolov8.png"></a>
     <!--
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