Fix has_unknown_spaces in Doc.copy
Fix has_unknown_spaces in Doc.copy

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