logging.go
func (logger *Logger) SetLevel(level Level) {
	logger.lock.Lock()
	logger.Level = level
	logger.flushBuffer()
	logger.lock.Unlock()
}
func (logger *Logger) SetLevel(level Level) {
	logger.lock.Lock()
	logger.Level = level
	logger.flushBuffer()
	logger.lock.Unlock()
}
func ( logger * Logger ) SetLevel ( level Level ) { logger . lock . Lock ( ) logger . Level = level logger . flushBuffer ( ) logger . lock . Unlock ( ) }
// SetLevel sets lower level that current logger will process.
SetLevel sets lower level that current logger will process .