Rename dataset_infos.json to dataset_info.json
MEMBER

This was actually the right name. `dataset_infos.json` is used to have the infos of all the dataset configurations.

On the other hand `dataset_info.json` (without 's') is a cache file with the info of one specific configuration.

To fix #228, we probably just have to clear and reload the nlp-viewer cache.
2020-06-03T12:48:33Z
https://github.com/huggingface/datasets/pull/229#issuecomment-638174857
https://api.github.com/repos/huggingface/datasets/issues/229
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2020-06-03T12:48:33Z
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As the file required for the viewing in the live nlp viewer is named as  dataset_info.json