docs: update paper link

Author: terryyz

README.md

@@ -7,7 +7,7 @@
     <a href="https://huggingface.co/spaces/bigcode/bigcodebench-leaderboard"><img src="https://img.shields.io/badge/🤗&nbsp&nbsp%F0%9F%8F%86-leaderboard-%23ff8811"></a>
     <a href="https://huggingface.co/collections/bigcode/bigcodebench-666ed21a5039c618e608ab06"><img src="https://img.shields.io/badge/🤗-collection-pink"></a>
     <a href="https://bigcode-bench.github.io/"><img src="https://img.shields.io/badge/%F0%9F%8F%86-website-8A2BE2"></a>
-    <a href="https://openreview.net/forum?id=1qvx610Cu7"><img src="https://img.shields.io/badge/arXiv-2406.15877-b31b1b.svg"></a>
+    <a href="https://arxiv.org/abs/2406.15877"><img src="https://img.shields.io/badge/arXiv-2406.15877-b31b1b.svg"></a>
     <a href="https://pypi.org/project/bigcodebench/"><img src="https://img.shields.io/pypi/v/bigcodebench?color=g"></a>
     <a href="https://pepy.tech/project/bigcodebench"><img src="https://static.pepy.tech/badge/bigcodebench"></a>
     <a href="https://hub.docker.com/r/bigcodebench/bigcodebench-evaluate" title="Docker-Eval"><img src="https://img.shields.io/docker/image-size/bigcodebench/bigcodebench-evaluate"></a>