add AG News dataset
CONTRIBUTOR
Thanks @jxmorris12 for adding this adding. 
Can you please add a small description of the PR?
2020-06-26T17:01:33Z
https://github.com/huggingface/datasets/pull/316#issuecomment-650288419
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2020-06-26T17:01:33Z
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adds support for the AG-News topic classification dataset