Add Children's Book Test (CBT) dataset
Hi @lhoestq,

I guess this PR can be closed since we merged #2044?

I have used the same link for the homepage, as it is where the dataset is provided, hope that is okay? Closing in favor of #2044, thanks again :)

> I have used the same link for the homepage, as it is where the dataset is provided, hope that is okay?

Yea it's ok actually, at that time I thought there was another homepage for this dataset
Add the Children's Book Test (CBT) from Facebook (Hill et al. 2016).

Sentence completion given a few sentences as context from a children's book.