social_i_qa wrong format of labels
@lhoestq, should I raise a PR for this? Just a minor change while reading labels text file
Hi,
there is extra "\n" in labels of social_i_qa datasets, no big deal, but I was wondering if you could remove it to make it consistent.
so label is 'label': '1\n', not '1'
thanks

```
>>> import datasets 
>>> from datasets import load_dataset
>>> dataset = load_dataset(
...    'social_i_qa')
cahce dir  /julia/cache/datasets
Downloading: 4.72kB [00:00, 3.52MB/s]                                                                                                  
cahce dir /julia/cache/datasets
Downloading: 2.19kB [00:00, 1.81MB/s]                                                                                                  
Using custom data configuration default
Reusing dataset social_i_qa (/julia/datasets/social_i_qa/default/0.1.0/4a4190cc2d2482d43416c2167c0c5dccdd769d4482e84893614bd069e5c3ba06)
>>> dataset['train'][0]
{'answerA': 'like attending', 'answerB': 'like staying home', 'answerC': 'a good friend to have', 'context': 'Cameron decided to have a barbecue and gathered her friends together.', 'label': '1\n', 'question': 'How would Others feel as a result?'}

```


social_i_qa wrong format of labels 
 Hi,
there is extra "\n" in labels of social_i_qa datasets, no big deal, but I was wondering if you could remove it to make it consistent.
so label is 'label': '1\n', not '1'
thanks

```
>>> import datasets 
>>> from datasets import load_dataset
>>> dataset = load_dataset(
...    'social_i_qa')
cahce dir  /julia/cache/datasets
Downloading: 4.72kB [00:00, 3.52MB/s]                                                                                                  
cahce dir /julia/cache/datasets
Downloading: 2.19kB [00:00, 1.81MB/s]                                                                                                  
Using custom data configuration default
Reusing dataset social_i_qa (/julia/datasets/social_i_qa/default/0.1.0/4a4190cc2d2482d43416c2167c0c5dccdd769d4482e84893614bd069e5c3ba06)
>>> dataset['train'][0]
{'answerA': 'like attending', 'answerB': 'like staying home', 'answerC': 'a good friend to have', 'context': 'Cameron decided to have a barbecue and gathered her friends together.', 'label': '1\n', 'question': 'How would Others feel as a result?'}

```

 
 @lhoestq, should I raise a PR for this? Just a minor change while reading labels text file