readme: reorder maintainers, add Stefan and Viktor
readme: reorder maintainers, add Stefan and Viktor

martijnhoekstra/scala,scala/scala,lrytz/scala,scala/scala,scala/scala,lrytz/scala,martijnhoekstra/scala,scala/scala,lrytz/scala,martijnhoekstra/scala,martijnhoekstra/scala,lrytz/scala,lrytz/scala,martijnhoekstra/scala,scala/scala,martijnhoekstra/scala,lrytz/scala,scala/scala