Issue: XNLI dataset is not loading 

`dataset = datasets.load_dataset(path='xnli')`

showing below error 
```
/opt/conda/lib/python3.7/site-packages/nlp/utils/info_utils.py in verify_checksums(expected_checksums, recorded_checksums, verification_name)
     36     if len(bad_urls) > 0:
     37         error_msg = "Checksums didn't match" + for_verification_name + ":\n"
---> 38         raise NonMatchingChecksumError(error_msg + str(bad_urls))
     39     logger.info("All the checksums matched successfully" + for_verification_name)
     40 

NonMatchingChecksumError: Checksums didn't match for dataset source files:
['https://www.nyu.edu/projects/bowman/xnli/XNLI-1.0.zip']
```

I think URL is now changed to "https://cims.nyu.edu/~sbowman/xnli/XNLI-MT-1.0.zip"

Comments:
also i tried below code to solve checksum error 
`datasets-cli test ./datasets/xnli --save_infos --all_configs`

and it shows 

```
2020-10-02 07:06:16.588760: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcudart.so.10.1
Traceback (most recent call last):
  File "/opt/conda/lib/python3.7/site-packages/datasets/load.py", line 268, in prepare_module
    local_path = cached_path(file_path, download_config=download_config)
  File "/opt/conda/lib/python3.7/site-packages/datasets/utils/file_utils.py", line 308, in cached_path
    use_etag=download_config.use_etag,
  File "/opt/conda/lib/python3.7/site-packages/datasets/utils/file_utils.py", line 474, in get_from_cache
    raise FileNotFoundError("Couldn't find file at {}".format(url))
FileNotFoundError: Couldn't find file at https://raw.githubusercontent.com/huggingface/datasets/1.0.2/datasets/./datasets/xnli/xnli.py

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/conda/lib/python3.7/site-packages/datasets/load.py", line 279, in prepare_module
    local_path = cached_path(file_path, download_config=download_config)
  File "/opt/conda/lib/python3.7/site-packages/datasets/utils/file_utils.py", line 308, in cached_path
    use_etag=download_config.use_etag,
  File "/opt/conda/lib/python3.7/site-packages/datasets/utils/file_utils.py", line 474, in get_from_cache
    raise FileNotFoundError("Couldn't find file at {}".format(url))
FileNotFoundError: Couldn't find file at https://s3.amazonaws.com/datasets.huggingface.co/datasets/datasets/./datasets/xnli/xnli.py

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/conda/bin/datasets-cli", line 36, in <module>
    service.run()
  File "/opt/conda/lib/python3.7/site-packages/datasets/commands/test.py", line 76, in run
    module_path, hash = prepare_module(path)
  File "/opt/conda/lib/python3.7/site-packages/datasets/load.py", line 283, in prepare_module
    combined_path, github_file_path, file_path
FileNotFoundError: Couldn't find file locally at ./datasets/xnli/xnli.py, or remotely at https://raw.githubusercontent.com/huggingface/datasets/1.0.2/datasets/./datasets/xnli/xnli.py or https://s3.amazonaws.com/datasets.huggingface.co/datasets/datasets/./datasets/xnli/xnli.py
```



Hi !
Yes the download url changed.
It's updated on the master branch. I'm doing a release today to fix that :)

the issue is fixed with latest release