Set version back to 2.1.0a4
Set version back to 2.1.0a4

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