logging.go
func RemoveLogger(name string) {
	lock.Lock()
	delete(loggers, name)
	if name == "default" {
		defaultLogger = nil
	}
	lock.Unlock()
}
func RemoveLogger(name string) {
	lock.Lock()
	delete(loggers, name)
	if name == "default" {
		defaultLogger = nil
	}
	lock.Unlock()
}
// RemoveLogger deletes logger from global logger registry.