adding RACE, QASC, Super_glue and Tiny_shakespear datasets
CONTRIBUTOR
I think rebasing to master will solve the quality test and the datasets that don't have a testing structure yet because of the manual download - maybe you can put them in `datasets under construction`? Then would also make it easier for me to see how to add tests for them :-) 
2020-05-12T13:18:41Z
https://github.com/huggingface/datasets/pull/70#issuecomment-627339217
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2020-05-12T13:18:41Z
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