Show a brief usage when no option is specified.
Show a brief usage when no option is specified.

Resolves #1009.

Saturn/livestreamer,Masaz-/livestreamer,programming086/livestreamer,intact/livestreamer,chhe/livestreamer,chhe/livestreamer,Klaudit/livestreamer,lyhiving/livestreamer,chrippa/livestreamer,okaywit/livestreamer,Dobatymo/livestreamer,lyhiving/livestreamer,Feverqwe/livestreamer,Masaz-/livestreamer,Klaudit/livestreamer,wolftankk/livestreamer,flijloku/livestreamer,derrod/livestreamer,hmit/livestreamer,charmander/livestreamer,programming086/livestreamer,Dobatymo/livestreamer,Feverqwe/livestreamer,hmit/livestreamer,okaywit/livestreamer,flijloku/livestreamer,caorong/livestreamer,charmander/livestreamer,Saturn/livestreamer,intact/livestreamer,chrippa/livestreamer,wolftankk/livestreamer,derrod/livestreamer,caorong/livestreamer