Bert-extractive-summaizer importing issue
Hi ,

I am facing issues while import summarizer.

NameError                                 Traceback (most recent call last)
<ipython-input-6-3b4384c20fe2> in <module>()
----> 1 from summarizer import Summarizer
      2 
      3 body = 'Text body that you want to summarize with BERT'
      4 body2 = 'Something else you want to summarize with BERT'
      5 model = Summarizer()

~/anaconda3/envs/amazonei_tensorflow_p36/lib/python3.6/site-packages/summarizer/__init__.py in <module>()
----> 1 from summarizer.model_processors import Summarizer, SingleModel, TransformerSummarizer

~/anaconda3/envs/amazonei_tensorflow_p36/lib/python3.6/site-packages/summarizer/model_processors.py in <module>()
----> 1 from summarizer.bert_parent import BertParent
      2 from summarizer.cluster_features import ClusterFeatures
      3 from summarizer.sentence_handler import SentenceHandler
      4 from typing import List
      5 from abc import abstractmethod

~/anaconda3/envs/amazonei_tensorflow_p36/lib/python3.6/site-packages/summarizer/bert_parent.py in <module>()
      9 
     10 
---> 11 class BertParent(object):
     12 
     13     """

~/anaconda3/envs/amazonei_tensorflow_p36/lib/python3.6/site-packages/summarizer/bert_parent.py in BertParent()
     16 
     17     MODELS = {
---> 18         'bert-base-uncased': (BertModel, BertTokenizer),
     19         'bert-large-uncased': (BertModel, BertTokenizer),
     20         'xlnet-base-cased': (XLNetModel, XLNetTokenizer),

**NameError: name 'BertModel' is not defined**

Please help me on this issue
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