Update README.md

README.md

@@ -57,7 +57,7 @@ CUDA: None
 
 The install cmd is:
 ```
-pip install torch==1.7.1+cpu torchvision==0.8.2+cpu torchaudio===0.7.2 -f https://download.pytorch.org/whl/torch_stable.html
+pip install torch==1.7.1+cpu torchvision==0.8.2+cpu -f https://download.pytorch.org/whl/torch_stable.html
 ```
 
 ### Installation