Update README.md

Works with [AutoModelsForZeroShotObjectDetection](https://huggingface.co/docs/transformers/v4.49.0/en/model_doc/auto#transformers.AutoModelForZeroShotObjectDetection)

README.md

@@ -1,6 +1,7 @@
 ---
 license: apache-2.0
 pipeline_tag: zero-shot-object-detection
+library_name: transformers
 ---
 
 # OmDet model