[Feature request] Add Shell to LogCronjobToFields

[Nicolas Rodriguez]

go-crond/logger.go

Lines 7 to 14 in d907b4b

 func LogCronjobToFields(cronjob CrontabEntry) log.Fields { 
 	return log.Fields{ 
 		"spec":    cronjob.Spec, 
 		"user":    cronjob.User, 
 		"command": cronjob.Command, 
 		"crontab": cronjob.CrontabPath, 
 	} 
 } 

Thank you!