update link to rf-detr

Author: capjamesg

README.md

@@ -9,7 +9,7 @@
   </p>
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-  [notebooks](https://github.com/roboflow/notebooks) | [inference](https://github.com/roboflow/inference) | [autodistill](https://github.com/autodistill/autodistill) | [collect](https://github.com/roboflow/roboflow-collect)
+  [notebooks](https://github.com/roboflow/notebooks) | [inference](https://github.com/roboflow/inference) | [autodistill](https://github.com/autodistill/autodistill) | [RF-DETR](https://github.com/roboflow/rf-detr)
 
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