Update README with new --auth behavior.
Update README with new --auth behavior.

HackerTool/httpie,danieldc/httpie,sofianhw/httpie,konopski/httpie,aredo/httpie,rusheel/httpie,hoatle/httpie,gnagel/httpie,jakubroztocil/httpie,jkbrzt/httpie,lingtalfi/httpie,kevinlondon/httpie,rschmidtz/httpie,aredo/httpie,PKRoma/httpie,meigrafd/httpie,alexeikabak/httpie,a-x-/httpie,Bogon/httpie,fontenele/httpie,hoatle/httpie,whitefoxx/httpie,Bogon/httpie,chaos33/httpie,a-x-/httpie,saisai/httpie,rusheel/httpie,guiquanz/httpie,fritaly/httpie,JPWKU/httpie,paran0ids0ul/httpie,fontenele/httpie,alex-bretet/httpie,ardydedase/httpie,meigrafd/httpie,kaushik94/httpie,lk1ngaa7/httpie,jcrumb/httpie,bright-sparks/httpie,alfcrisci/httpie,zerin108/httpie,keita1314/httpie,rgordeev/httpie,vietlq/httpie,rschmidtz/httpie,zerodark/httpie,wandec/first,codingjoe/httpie,ardydedase/httpie,normabuttz/httpie,mblayman/httpie,jkbrzt/httpie,alex-bretet/httpie,rgordeev/httpie,marklap/httpie,whitefoxx/httpie,Batterfii/httpie,tylertebbs20/Practice-httpie,konopski/httpie,codingjoe/httpie,bgarrels/httpie,sofianhw/httpie,bitcoinfees/two1-httpie,alexeikabak/httpie,jakubroztocil/httpie,jcrumb/httpie,GrimDerp/httpie,vietlq/httpie,insionng/httpie,lingtalfi/httpie,saisai/httpie,gnagel/httpie,insionng/httpie,PKRoma/httpie,tylertebbs20/Practice-httpie,MiteshShah/httpie,keita1314/httpie,zerin108/httpie,paran0ids0ul/httpie,GrimDerp/httpie,guiquanz/httpie,Batterfii/httpie,jkbrzt/httpie,mblayman/httpie,danieldc/httpie,normabuttz/httpie,HackerTool/httpie,bgarrels/httpie,fritaly/httpie,bitcoinfees/two1-httpie,JPWKU/httpie,avtoritet/httpie,kevinlondon/httpie,zerodark/httpie,jakubroztocil/httpie,avtoritet/httpie,bright-sparks/httpie,lk1ngaa7/httpie,MiteshShah/httpie,alfcrisci/httpie,marklap/httpie