several code changes during my test

[godlockin]

I did the following changes during my using this lib, but i'm not sure if bugs involved in my changes.

OS: Mac
Python: 3.8

steps:

1. install
   changed requirements.txt from

psutil>=2.1.1
networkx>=2.0

into

psutil>=5.8.0
networkx>=2.6.3

to fix the dependencies analysis issue

2. init env
   remove the line from gensim.models.word2vec import Vocab from skipgram.py (line 8)
   as the Vocab doesn't belong to the gensim.models.vord2vec any more, and it will cause a compile issue

3. run the function
   migrate
   model = Word2Vec(walks, size=args.representation_size, window=args.window_size, min_count=0, sg=1, hs=1, workers=args.workers)
   into
   model = Word2Vec(walks, vector_size=args.representation_size, window=args.window_size, min_count=0, sg=1, hs=1, workers=args.workers)

as the param of size doesn't in word2vec.py, and I'm not sure if the representation_size is the vector_size as the description of api: vector_size : int, optional, Dimensionality of the word vectors.