chore: license comment

runnable-sftp_test.go

runnable-shell.go

runnable-shell_test.go

runnable.go

runnable_test.go

schedule-cron.go

schedule-delay.go

schedule-interval.go

schedule-time.go

scheduler-event.go

scheduler-inotify.go

scheduler-instant.go

scheduler.go

scheduler_test.go

stat.go

stat_test.go

time-formats.go

topological-sort.go

topological-sort_test.go

util.go