logger

type Config struct {
	Environment string
	TimeFormat  string
	Output      string
	Level       string
	Path        string
	FilePerms   os.FileMode
}

type LogEvent interface {
	Str(key string, value string) LogEvent
	Int(key string, value int) LogEvent
	Bool(key string, value bool) LogEvent
	Float64(key string, value float64) LogEvent
	Err(err error) LogEvent
	Interface(key string, value interface{}) LogEvent
	Time(key string, value time.Time) LogEvent
	Dur(key string, value time.Duration) LogEvent
	Msg(msg string)
	Msgf(format string, v ...interface{})
}