muchocine dataset cannot be dowloaded
I have encountered the same error with `v1.0.1` and `v1.0.2` on both Windows and Linux environments. However, cloning the repo and using the path to the dataset's root directory worked for me. Even after having the dataset cached - passing the path is the only way (for now) to load the dataset.

```python
from datasets import load_dataset

dataset = load_dataset("squad")                      # Works
dataset = load_dataset("code_search_net", "python")  # Error
dataset = load_dataset("covid_qa_deepset")           # Error

path = "/huggingface/datasets/datasets/{}/"
dataset = load_dataset(path.format("code_search_net"), "python")  # Works
dataset = load_dataset(path.format("covid_qa_deepset"))           # Works
```


```python
---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
/usr/local/lib/python3.6/dist-packages/datasets/load.py in prepare_module(path, script_version, download_config, download_mode, dataset, force_local_path, **download_kwargs)
    267         try:
--> 268             local_path = cached_path(file_path, download_config=download_config)
    269         except FileNotFoundError:

7 frames
FileNotFoundError: Couldn't find file at https://raw.githubusercontent.com/huggingface/datasets/1.0.2/datasets/muchocine/muchocine.py

During handling of the above exception, another exception occurred:

FileNotFoundError                         Traceback (most recent call last)
FileNotFoundError: Couldn't find file at https://s3.amazonaws.com/datasets.huggingface.co/datasets/datasets/muchocine/muchocine.py

During handling of the above exception, another exception occurred:

FileNotFoundError                         Traceback (most recent call last)
/usr/local/lib/python3.6/dist-packages/datasets/load.py in prepare_module(path, script_version, download_config, download_mode, dataset, force_local_path, **download_kwargs)
    281                 raise FileNotFoundError(
    282                     "Couldn't find file locally at {}, or remotely at {} or {}".format(
--> 283                         combined_path, github_file_path, file_path
    284                     )
    285                 )

FileNotFoundError: Couldn't find file locally at muchocine/muchocine.py, or remotely at https://raw.githubusercontent.com/huggingface/datasets/1.0.2/datasets/muchocine/muchocine.py or https://s3.amazonaws.com/datasets.huggingface.co/datasets/datasets/muchocine/muchocine.py
```
muchocine dataset cannot be dowloaded 
 ```python
---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
/usr/local/lib/python3.6/dist-packages/datasets/load.py in prepare_module(path, script_version, download_config, download_mode, dataset, force_local_path, **download_kwargs)
    267         try:
--> 268             local_path = cached_path(file_path, download_config=download_config)
    269         except FileNotFoundError:

7 frames
FileNotFoundError: Couldn't find file at https://raw.githubusercontent.com/huggingface/datasets/1.0.2/datasets/muchocine/muchocine.py

During handling of the above exception, another exception occurred:

FileNotFoundError                         Traceback (most recent call last)
FileNotFoundError: Couldn't find file at https://s3.amazonaws.com/datasets.huggingface.co/datasets/datasets/muchocine/muchocine.py

During handling of the above exception, another exception occurred:

FileNotFoundError                         Traceback (most recent call last)
/usr/local/lib/python3.6/dist-packages/datasets/load.py in prepare_module(path, script_version, download_config, download_mode, dataset, force_local_path, **download_kwargs)
    281                 raise FileNotFoundError(
    282                     "Couldn't find file locally at {}, or remotely at {} or {}".format(
--> 283                         combined_path, github_file_path, file_path
    284                     )
    285                 )

FileNotFoundError: Couldn't find file locally at muchocine/muchocine.py, or remotely at https://raw.githubusercontent.com/huggingface/datasets/1.0.2/datasets/muchocine/muchocine.py or https://s3.amazonaws.com/datasets.huggingface.co/datasets/datasets/muchocine/muchocine.py
``` 
 I have encountered the same error with `v1.0.1` and `v1.0.2` on both Windows and Linux environments. However, cloning the repo and using the path to the dataset's root directory worked for me. Even after having the dataset cached - passing the path is the only way (for now) to load the dataset.

```python
from datasets import load_dataset

dataset = load_dataset("squad")                      # Works
dataset = load_dataset("code_search_net", "python")  # Error
dataset = load_dataset("covid_qa_deepset")           # Error

path = "/huggingface/datasets/datasets/{}/"
dataset = load_dataset(path.format("code_search_net"), "python")  # Works
dataset = load_dataset(path.format("covid_qa_deepset"))           # Works
```

