Remove explicit Darwin import from usage example
Remove explicit Darwin import from usage example

Thanks to #2, it's not needed any more.

bartekchlebek/CommandLine,deszip/CommandLine,jatoben/CommandLine,deszip/CommandLine,bartekchlebek/CommandLine,IngmarStein/CommandLine,deszip/CommandLine,sebcode/CommandLine,jatoben/CommandLine,sebcode/CommandLine,IngmarStein/CommandLine,aclissold/CommandLine