[Feature request] Add Toronto BookCorpus dataset
CONTRIBUTOR
As far as I understand, `wikitext` is refer to `WikiText-103` and `WikiText-2` that created by researchers in Salesforce, and mostly used in traditional language modeling.

You might want to say `wikipedia`, a dump from wikimedia foundation.

Also I would like to have Toronto BookCorpus too ! Though it involves copyright problem...
2020-05-17T01:45:08Z
https://github.com/huggingface/datasets/issues/131#issuecomment-629730186
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CONTRIBUTOR
Hi, @lhoestq, just a reminder that this is solved by #248 .😉 
2020-06-15T06:28:03Z
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I know the copyright/distribution of this one is complex, but it would be great to have! That, combined with the existing `wikitext`, would provide a complete dataset for pretraining models like BERT.