add README note about using BLAS
add README note about using BLAS

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