Update README.md

- scikit-learn==0.21.2

- scipy==1.3.0

- seaborn==0.9.0

- sklearn==0.0

- spacy==2.1.4

**NOTE**: _spacy_ must not be version 2.1.5!

English language model for spacy:

For spacy to work, you also need an English language model. The smallest one can be downloaded like this:

    python -m spacy download en-core-web-sm

    python -m spacy download en_core_web_sm

For a list of all available models for English, please refer to the official [documentation](https://spacy.io/models/en).

In general, the larger the model is, the better spacy's performance becomes.

## How to create knowledge graphs