Exit with status "1" when `hub` is run without arguments
Exit with status "1" when `hub` is run without arguments

This mimics `git` behavior.

dongjoon-hyun/hub,whilp/hub,boris-rea/hub,github/hub,github/hub,cpick/hub,github/hub,rlugojr/hub,pcorpet/hub,github/hub,dongjoon-hyun/hub,pcorpet/hub,tomasv/hub,boris-rea/hub,boris-rea/hub,pcorpet/hub,whilp/hub,rlugojr/hub,dongjoon-hyun/hub,whilp/hub,cpick/hub,rlugojr/hub,tomasv/hub,tomasv/hub,cpick/hub