Update nightly ROCm pytorch command in readme to 5.6

README.md

@@ -93,8 +93,8 @@ AMD users can install rocm and pytorch with pip if you don't have it already ins
 
 ```pip install torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/rocm5.4.2```
 
-This is the command to install the nightly with ROCm 5.5 that supports the 7000 series and might have some performance improvements:
-```pip install --pre torch torchvision torchaudio --index-url https://download.pytorch.org/whl/nightly/rocm5.5 -r requirements.txt```
+This is the command to install the nightly with ROCm 5.6 that supports the 7000 series and might have some performance improvements:
+```pip install --pre torch torchvision torchaudio --index-url https://download.pytorch.org/whl/nightly/rocm5.6 -r requirements.txt```
 
 ### NVIDIA