Update README.md

Author: anxiangsir

README.md

@@ -14,7 +14,7 @@
 
 🤗 **[Models and Datasets](https://huggingface.co/collections/lmms-lab/llava-onevision-15-68d385fe73b50bd22de23713)** |
 🖥️ **[Demo](https://huggingface.co/spaces/lmms-lab/LLaVA-OneVision-1.5)** |
-📄 **[Tech Report](https://github.com/anxiangsir/asset/blob/main/paper/LLaVA_OneVision_1_5.pdf)**
+📄 **[Tech Report](https://arxiv.org/abs/2509.23661)**
 
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