added conv ai 2
CONTRIBUTOR
@lhoestq Thank you for the suggestions. I added the changes to the branch and seems after rebasing it to master, all the commits previous commits got added. Should I create a new PR or should I keep this one only ? 
2020-12-10T17:56:04Z
https://github.com/huggingface/datasets/pull/1383#issuecomment-742688748
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2020-12-10T17:56:04Z
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closing this one in favor of #1527 
2020-12-13T18:54:41Z
https://github.com/huggingface/datasets/pull/1383#issuecomment-744051880
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Dataset : https://github.com/DeepPavlov/convai/tree/master/2018