The documentation says you need to:
python -m spacy download en_core_web_sm
Alternatively, you can install from the URL (which you should be able to include into a requirements.txt file):
pip install https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-2.2.0/en_core_web_sm-2.2.0.tar.gz
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