Add DaNe dataset
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Thanks, this looks great!

For the code quality test, it looks like `flake8` is throwing the error, so you can tun `flake8 datasets` locally and fix the errors it points out until it passes
2020-12-05T20:26:07Z
https://github.com/huggingface/datasets/pull/1164#issuecomment-739406918
https://api.github.com/repos/huggingface/datasets/issues/1164
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2020-12-05T20:26:07Z
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