Update README.md

Author: ChonghaoSima

README.md

@@ -11,7 +11,7 @@ https://github.com/OpenDriveLab/OccNet/assets/54334254/92fb43a0-0ee8-4eab-aa53-0
 
 
 > **Scene as Occupancy**
-> - [Paper in arXiv]() | [CVPR 2023 AD Challenge Occupancy Track](https://opendrivelab.com/AD23Challenge.html#Track3)
+> - [Paper in arXiv (to be released soon)]() | [CVPR 2023 AD Challenge Occupancy Track](https://opendrivelab.com/AD23Challenge.html#Track3)
 > - Point of contact: [[email protected]](mailto:[email protected]) or [[email protected]](mailto:[email protected]). Any inquiries are welcome! 
 
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