Update GETTING_STARTED.md
Update GETTING_STARTED.md
atscott/flex-layout,angular/flex-layout,atscott/flex-layout,benbraou/flex-layout,angular/flex-layout,atscott/flex-layout,DevVersion/flex-layout,benbraou/flex-layout,angular/flex-layout,atscott/flex-layout,karlhaas/flex-layout,karlhaas/flex-layout,brendanoffer/flex-layout,angular/flex-layout,DevVersion/flex-layout,d3viant0ne/flex-layout,benbraou/flex-layout,brendanoffer/flex-layout,benbraou/flex-layout,brendanoffer/flex-layout,d3viant0ne/flex-layout,karlhaas/flex-layout,d3viant0ne/flex-layout,DevVersion/flex-layout