Fix README for ls command
Fix README for ls command

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