add yahoo_answers_topics
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feel free to merge/ping me to merge if there're no more changes to do
2020-12-02T17:53:42Z
https://github.com/huggingface/datasets/pull/1006#issuecomment-737393781
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2020-12-02T17:53:42Z
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This PR adds yahoo answers topic classification dataset.

More info:
https://github.com/LC-John/Yahoo-Answers-Topic-Classification-Dataset

cc @joeddav, @yjernite 