Consider adding `ipywidgets` as a dependency.
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Hi! We use `tqdm` to display progress bars, so I suggest you open this issue in their repo. It depends on how you use `tqdm`, no? 

Doesn't this library import via; 

```
from tqdm.notebook import tqdm
``` Hi! Sorry for the late reply. We import `tqdm` as `from tqdm.auto import tqdm`, which should be equal to `from tqdm.notebook import tqdm` in Jupyter. Any objection if I make a PR that checks if the widgets library is installed beforehand? 
When I install `datasets` in a fresh virtualenv with jupyterlab I always see this error. 

```
ImportError: IProgress not found. Please update jupyter and ipywidgets. See https://ipywidgets.readthedocs.io/en/stable/user_install.html
```

It's a bit of a nuisance, because I need to run shut down the jupyterlab server in order to install the required dependency. Might it be an option to just include it as a dependency here? 
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