Add missing comma in /doc/USAGE.md
Add missing comma in /doc/USAGE.md
matthughes/scalajs-react,zlangbert/scalajs-react,beni55/scalajs-react,beni55/scalajs-react,7thsense/scalajs-react,japgolly/scalajs-react,japgolly/scalajs-react,japgolly/scalajs-react,7thsense/scalajs-react,japgolly/scalajs-react,matthughes/scalajs-react,beni55/scalajs-react,7thsense/scalajs-react,CodeMettle/scalajs-react,CodeMettle/scalajs-react,zlangbert/scalajs-react,matthughes/scalajs-react,CodeMettle/scalajs-react,zlangbert/scalajs-react