logging.go
func (logger *Logger) Infof(format string, a ...interface{}) {
	logger.log(INFO, format, a...)
}
func (logger *Logger) Infof(format string, a ...interface{}) {
	logger.log(INFO, format, a...)
}
func ( logger * Logger ) Infof ( format string , a ... interface { } ) { logger . log ( INFO , format , a ... ) }
// Infof logs provided message with formatting in INFO level.
Infof logs provided message with formatting in INFO level .