DecomposedRouge spacy model version is incorrect

The spacy model version 2.2.5 is unable to be installed via the python -m spacy download command, but I think it can be via the pip url used in requirements.txt:

sacrerouge/requirements.txt

Line 11 in ee776dc

    
           https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-2.2.5/en_core_web_sm-2.2.5.tar.gz

The DecomposedRouge metric setup tries to install it via download and it fails:

sacrerouge/sacrerouge/metrics/decomposed_rouge/decomposed_rouge.py

Line 243 in ee776dc

command = 'python -m spacy download en_core_web_sm-2.2.5'

Fixed by #72