issue with loading pretrained model - xlnet
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I ran the following code: 
from transformers import XLNetTokenizer, XLNetForSequenceClassification
import torch
tokenizer = XLNetTokenizer.from_pretrained('xlnet-base-cased')
model = XLNetForSequenceClassification.from_pretrained('xlnet-base-cased')

## Details
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and I have the following error: 

> OSError: Can't load config for 'xlnet-base-cased'. Make sure that:

> 'xlnet-base-cased' is a correct model identifier listed on 'https://huggingface.co/models'

> or 'xlnet-base-cased' is the correct path to a directory containing a config.json file


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The error didn't appear when I ran the same piece of code two days ago so I think it might be caused by recent update. 