Remove stale TODO
Remove stale TODO

Closes scala/collection-strawman#536

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