[dist] Update .gitignore to include node_modules
[dist] Update .gitignore to include node_modules

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