Update README.md

README.md

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 - **Homepage:** [LORIS](https://justinyuu.github.io/LORIS)
 - **Repository:** [OpenGVLab-LORIS](https://github.com/OpenGVLab/LORIS)
-- **Paper:** https://arxiv.org/pdf/2305.01319.pdf
+- **Paper:** [2305.01319](https://arxiv.org/pdf/2305.01319.pdf)
 - **Point of Contact:** [yujiashuo](mailto:yujiashuo@pjlab.org.cn)
 
 ### Dataset Summary