huggingface_pytorch-pretrained-bert_bert.ipynb -- RuntimeError: Cannot find callable bertTokenizer in hubconf
## Environment info
Google Colab
https://colab.research.google.com/github/pytorch/pytorch.github.io/blob/master/assets/hub/huggingface_pytorch-pretrained-bert_bert.ipynb#scrollTo=bb1RXLUYj_Wv

- Using GPU in script?: yes

Models:

BERT

## To reproduce

Steps to reproduce the behavior:

```
### First, tokenize the input
import torch
tokenizer = torch.hub.load('huggingface/pytorch-pretrained-BERT', 'bertTokenizer', 'bert-base-cased', do_basic_tokenize=False)

# Tokenized input
text = "[CLS] Who was Jim Henson ? [SEP] Jim Henson was a puppeteer [SEP]"
tokenized_text = tokenizer.tokenize(text)
indexed_tokens = tokenizer.convert_tokens_to_ids(tokenized_text)
```

Get error stack

```
Downloading: "https://github.com/huggingface/pytorch-pretrained-BERT/archive/master.zip" to /root/.cache/torch/hub/master.zip
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-2-0cb4dd772680> in <module>()
      1 ### First, tokenize the input
      2 import torch
----> 3 tokenizer = torch.hub.load('huggingface/pytorch-pretrained-BERT', 'bertTokenizer', 'bert-base-cased', do_basic_tokenize=False)
      4 
      5 # Tokenized input

2 frames
/usr/local/lib/python3.7/dist-packages/torch/hub.py in load(repo_or_dir, model, source, force_reload, verbose, skip_validation, *args, **kwargs)
    397         repo_or_dir = _get_cache_or_reload(repo_or_dir, force_reload, verbose, skip_validation)
    398 
--> 399     model = _load_local(repo_or_dir, model, *args, **kwargs)
    400     return model
    401 

/usr/local/lib/python3.7/dist-packages/torch/hub.py in _load_local(hubconf_dir, model, *args, **kwargs)
    425     hub_module = import_module(MODULE_HUBCONF, hubconf_path)
    426 
--> 427     entry = _load_entry_from_hubconf(hub_module, model)
    428     model = entry(*args, **kwargs)
    429 

/usr/local/lib/python3.7/dist-packages/torch/hub.py in _load_entry_from_hubconf(m, model)
    233 
    234     if func is None or not callable(func):
--> 235         raise RuntimeError('Cannot find callable {} in hubconf'.format(model))
    236 
    237     return func

RuntimeError: Cannot find callable bertTokenizer in hubconf

```
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