Update README to fix install of huggingfacecli command

I ran into the issue with this method of installation that I did not have the download positional argument. Changing it to this command I added fixed that.

README.md

@@ -148,7 +148,7 @@ Then click Download.
 I recommend using the `huggingface-hub` Python library:
 
 ```shell
-pip3 install huggingface-hub
+pip3 install -U "huggingface_hub[cli]"
 ```
 
 Then you can download any individual model file to the current directory, at high speed, with a command like this: