Add note on merging speed in v2.1 (see #3300) [ci skip]
Add note on merging speed in v2.1 (see #3300) [ci skip]

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