update mirror for RT dataset
MEMBER
Thanks for adding this mirror link :)

Could you run the following command to update the json file `dataset_infos.json` used to verify the integrity of the downloaded file ?

```
nlp-cli test ./datasets/rotten_tomatoes --save_infos --ignore_verifications
```
2020-08-11T16:43:08Z
https://github.com/huggingface/datasets/pull/484#issuecomment-672081184
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2020-08-11T16:43:08Z
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CONTRIBUTOR
done! @lhoestq 
2020-08-11T18:11:57Z
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MEMBER
the build_doc CI fail comes from master and has been fixed on master
2020-08-12T09:30:11Z
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2020-08-12T09:30:11Z
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CONTRIBUTOR
done @thomwolf @lhoestq 
2020-08-17T18:23:55Z
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