Update README.md

Author: ZrrSkywalker

README.md

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 # LLaMA-Adapter: Efficient Fine-tuning of LLaMA 🚀
 
-Official implementation of ['LLaMA-Adapter: Efficient Fine-tuning of Language Models with Zero-init Attention'](https://arxiv.org/abs/2303.16199).
+Official implementation of ['LLaMA-Adapter: Efficient Fine-tuning of Language Models with Zero-init Attention'](https://arxiv.org/abs/2303.16199) and ['LLaMA-Adapter V2: Parameter-Efficient Visual Instruction Model'](https://arxiv.org/pdf/2304.15010.pdf).
 
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