Ch07 use contractions_dict instead of import CONTRACTION_MAP

[sony-git]

Hi,

In the chapter 7 :: https://github.com/dipanjanS/practical-machine-learning-with-python/blob/master/notebooks/Ch07_Analyzing_Movie_Reviews_Sentiment/Text%20Normalization%20Demo.ipynb ,

please use contractions_dict instead of "import CONTRACTION_MAP".

Also, please correct the spaCy load.