Can not install DATASET

## 📚 Documentation Issue

Hey ! I'm following the different instructions to install any of these datasets:

[https://github.com/facebookresearch/detectron2/blob/main/datasets/README.md
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I'm trying to install Lvis dataset, but after executing
`pip install git+https://github.com/cocodataset/panopticapi.git`
I'm seeing that is not clonning any repo.

Also when I execute

`python3 datasets/prepare_cocofied_lvis.p`
I can verify that is looking of a version 0.5 that it doesn't exists anymore in the website of Lvis.

What I'm doing wrong ? Or the document just became obsolete ?

Thanks