No cache in smart update
...since it was causing 

```
smart_update_dataset failed with PermissionError: [Errno 13] Permission denied: '/.cache'
```

I used the HfFileSystem instead to read the README.md files, since it doesn't use caching
No cache in smart update: ...since it was causing 

```
smart_update_dataset failed with PermissionError: [Errno 13] Permission denied: '/.cache'
```

I used the HfFileSystem instead to read the README.md files, since it doesn't use caching