Fix ArXiv link in model card (#1)

- Fix ArXiv link in model card (b7d3b98c95d84ffefd8b5ba9d49dd0ae97289c67)


Co-authored-by: Omar Sanseviero <osanseviero@users.noreply.huggingface.co>

README.md

@@ -12,4 +12,4 @@ By analyzing the language content, GPT4Tools is capable of automatically decidin
 With this approach, GPT4Tools provides a seamless and efficient solution to fulfill various image-related requirements in a conversation.
 Different from previous work, we support users teach their own LLM to use tools with simple refinement via self-instruction and LoRA.
 
-<a href='https://github.com/StevenGrove/GPT4Tools'><img src='https://img.shields.io/badge/Project-Page-Green'></a>  <a href='https://huggingface.co/stevengrove/gpt4tools-vicuna-13b-lora'><img src='https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-Model-blue'></a>  [![YouTube](https://badges.aleen42.com/src/youtube.svg)](https://youtu.be/Qrj94ibQIT8) [![arXiv](https://img.shields.io/badge/arXiv-Paper-<COLOR>.svg)]()
+<a href='https://github.com/StevenGrove/GPT4Tools'><img src='https://img.shields.io/badge/Project-Page-Green'></a>  <a href='https://huggingface.co/stevengrove/gpt4tools-vicuna-13b-lora'><img src='https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-Model-blue'></a>  [![YouTube](https://badges.aleen42.com/src/youtube.svg)](https://youtu.be/Qrj94ibQIT8) [![arXiv](https://img.shields.io/badge/arXiv-Paper-<COLOR>.svg)](https://arxiv.org/abs//2305.18752)