Add Xitsonga Ner
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looks like this PR includes changes about many files other than the ones related to xitsonga NER

could you create another branch and another PR please ?
2020-12-06T17:34:37Z
https://github.com/huggingface/datasets/pull/1124#issuecomment-739535889
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2020-12-06T17:34:37Z
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Clean Xitsonga Ner PR