Fix for windows. On windows there is no _ in environment.
Fix for windows. On windows there is no _ in environment.

geophree/yargs,elas7/yargs,bcoe/yargs,LoicMahieu/yargs,oti/yargs,tepez/yargs,dkoleary88/yargs,tepez/yargs,yargs/yargs,sgentle/yargs,ammeep/yargs,elas7/yargs,dkoleary88/yargs,yargs/yargs,zkat/yargs,nexdrew/yargs,ChristianMurphy/yargs,yargs/yargs,bcoe/yargs,raine/yargs,ggoodman/yargs,jean-emmanuel/yargs,nexdrew/yargs,jean-emmanuel/yargs,etiktin/yargs,geophree/yargs,jvdm/yargs,ammeep/yargs,Teino1978-Corp/Teino1978-Corp-node-optimist,rstacruz/yargs,substack/node-optimist