Fix requirements.txt example (see #1638)
Fix requirements.txt example (see #1638)

spacy-io/spaCy,explosion/spaCy,explosion/spaCy,honnibal/spaCy,aikramer2/spaCy,explosion/spaCy,aikramer2/spaCy,recognai/spaCy,aikramer2/spaCy,explosion/spaCy,spacy-io/spaCy,explosion/spaCy,spacy-io/spaCy,explosion/spaCy,recognai/spaCy,recognai/spaCy,recognai/spaCy,spacy-io/spaCy,recognai/spaCy,spacy-io/spaCy,aikramer2/spaCy,honnibal/spaCy,honnibal/spaCy,aikramer2/spaCy,recognai/spaCy,honnibal/spaCy,aikramer2/spaCy,spacy-io/spaCy