Update CHANGELOG.md
Update CHANGELOG.md
gojomo/gensim,piskvorky/gensim,RaRe-Technologies/gensim,piskvorky/gensim,RaRe-Technologies/gensim,gojomo/gensim,gojomo/gensim,RaRe-Technologies/gensim,piskvorky/gensim,gojomo/gensim,RaRe-Technologies/gensim