Use `uname -m` instead of `uname -a`.
Use `uname -m` instead of `uname -a`.

Fixes #744.

gtdeng/nvm,JasonChrYoung/nvm,cjac/nvm,mirydz/nvm,ljharb/nvm,wahyutaufik/nvm,elrasguno/nvm,greyhwndz/nvm,Ingelheim/nvm,woss/nvm,michael-ni/nvm,vinaykaradia/clone-nvm,tlevine/nvm,youleiy/nvm,thomasf/nvm,chinazhaghai/nvm,egilkh/nvm,kmctown/nvm,williamboman/nvm,Theodeus/nvm,bevacqua/nvm,joneit/nvm,nontage24/nvm,hanhailong/nvm,mirydz/nvm,wahyutaufik/nvm,jbergstroem/nvm,greyhwndz/nvm,thomasf/nvm,nontage24/nvm,icyflame/nvm,wskplho/nvm,PeterDaveHello/nvm,mmorejon/nvm,edwmurph/nvm,bevacqua/nvm,reybango/nvm,diegofcb10/nvm,lukechilds/nvm,creationix/nvm,evocateur/nvm,cirosantilli/nvm,kumaria/nvm,owen-it/nvm,domenicosolazzo/nvm,woss/nvm,mmorejon/nvm,devedbox/nvm,youleiy/nvm,gtdeng/nvm,Ingelheim/nvm,joneit/nvm,hkdobrev/nvm,slariviere/nvm,creationix/nvm,Richardphp/nvm,parasaro92/nvm,kmctown/nvm,cnpm/nvm,slariviere/nvm,bbuck/nvm,christophercaburog/nvm,jhliberty/nvm,Kuzirashi/nvm,chinazhaghai/nvm,pmq20/nvm,hkdobrev/nvm,Kuzirashi/nvm,lukechilds/nvm,evocateur/nvm,tianzhihen/nvm,devedbox/nvm,diegofcb10/nvm,owen-it/nvm,WY08271/nvm,domenicosolazzo/nvm,christophercaburog/nvm,JasonChrYoung/nvm,Theodeus/nvm,Salahudeen/nvm,ljharb/nvm,WY08271/nvm,Richardphp/nvm,icyflame/nvm,cirosantilli/nvm,SampleLiao/nvm,SampleLiao/nvm,PeterDaveHello/nvm,tianzhihen/nvm,CristianCantoro/nvm,jbergstroem/nvm,Salahudeen/nvm,PeterDaveHelloKitchen/nvm,hanhailong/nvm,JanChw/nvm,jaawerth/nvm,tlevine/nvm,IonicaBizauKitchen/nvm,pmq20/nvm,kumaria/nvm,edwmurph/nvm,DigitallySeamless/nvm,scq000/nvm,dfackler/nvm,psychoss/nvm,fnogatz/swivm,modulexcite/nvm,DigitallySeamless/nvm,jhliberty/nvm,parasaro92/nvm,egilkh/nvm,wskplho/nvm,CristianCantoro/nvm,reybango/nvm,IonicaBizauKitchen/nvm,bbuck/nvm,williamboman/nvm,michael-ni/nvm,modulexcite/nvm,JanChw/nvm,cjac/nvm,cnpm/nvm,psychoss/nvm,PeterDaveHelloKitchen/nvm,elrasguno/nvm,jaawerth/nvm,dfackler/nvm,scq000/nvm,vinaykaradia/clone-nvm