Update README.md

README.md

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 pretty_name: XCodeSearchNet
 ---
 
-[Paper on arXiv](arxiv.org/abs/2306.15604)
+[Paper on arXiv](https://arxiv.org/abs/2306.15604)
 
 ##　pre-training data
 You need to manually combine each dataset if you want to use a multilingual dataset.