提前踩坑了！求更新readme!

[LinHouYu]

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[781572496]

Pytorch目前版本已要求使用Python 3.9 及以上版本安装。
若在Python 3.8版本中使用pip install torch torchvision torchaudio指令，已无法顺利安装pytorch。
可以考虑将要求的python最低版本修正为Python 3.9。

python 3.8版本下使用pip install torch torchvision torchaudio指令安装pytorch会出现报错提示未找到满足需求的pytorch版本报错：