changelog: add a note how to produce old behavior in load_word2vec_format()
changelog: add a note how to produce old behavior in load_word2vec_format()

manasRK/gensim,tzoiker/gensim,laic/gensim,mattilyra/gensim,manasRK/gensim,markroxor/gensim,robotcator/gensim,markroxor/gensim,isohyt/gensim,jaksmid/gensim,olavurmortensen/gensim,gojomo/gensim,zachmayer/gensim,bhargavvader/gensim,jaksmid/gensim,pombredanne/gensim,akutuzov/gensim,loisaidasam/gensim,piskvorky/gensim,ziky90/gensim,tzoiker/gensim,RaRe-Technologies/gensim,quole/gensim,olavurmortensen/gensim,pombredanne/gensim,zachmayer/gensim,ELind77/gensim,davechallis/gensim,markroxor/gensim,gojomo/gensim,summanlp/gensim,dsquareindia/gensim,robotcator/gensim,zachmayer/gensim,gojomo/gensim,RaRe-Technologies/gensim,mattilyra/gensim,Kreiswolke/gensim,ELind77/gensim,jaksmid/gensim,summanlp/gensim,macks22/gensim,isohyt/gensim,summanlp/gensim,quole/gensim,bhargavvader/gensim,Kreiswolke/gensim,RaRe-Technologies/gensim,akutuzov/gensim,loisaidasam/gensim,davechallis/gensim,quole/gensim,laic/gensim,mattilyra/gensim,dsquareindia/gensim,loisaidasam/gensim,laic/gensim,macks22/gensim,robotcator/gensim,ziky90/gensim,bhargavvader/gensim,davechallis/gensim,piskvorky/gensim,akutuzov/gensim,RaRe-Technologies/gensim,manasRK/gensim,dsquareindia/gensim,piskvorky/gensim,pombredanne/gensim,tzoiker/gensim,ELind77/gensim,Kreiswolke/gensim,olavurmortensen/gensim,isohyt/gensim,macks22/gensim,gojomo/gensim,ziky90/gensim