update readme

Author: nanamma

README.md

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 <div align="center">
 
-<h1>
+<h2>
     RIVER: A Real-Time Interaction Benchmark for Video LLMs
-</h1>
+</h2>
 
 <img src="assets/RIVER logo.png" width="80" alt="RIVER logo">
 
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 [Xiangyu Zeng](https://scholar.google.com/citations?user=jS13DXkAAAAJ&hl), 
 [Yi Wang](https://scholar.google.com/citations?user=Xm2M8UwAAAAJ), 
 [Limin Wang<sup>†</sup>](https://scholar.google.com/citations?user=HEuN8PcAAAAJ)  
-[[💻 GitHub]](https://huggingface.co/datasets/nanamma/RIVER), 
+[[💻 GitHub]](https://github.com/OpenGVLab/RIVER), 
 [[🤗 Dataset on HF]](https://huggingface.co/datasets/nanamma/RIVER), 
 [[📄 ArXiv]](https://arxiv.org/abs/2603.03985)
 </div>