Add clean menyo20k data
CONTRIBUTOR
@lhoestq  rerun the tests 
2020-12-10T19:55:37Z
https://github.com/huggingface/datasets/pull/1465#issuecomment-742759572
https://api.github.com/repos/huggingface/datasets/issues/1465
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2020-12-10T19:55:37Z
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New Clean PR for menyo20k_mt