Added the additional flags without formatting

[MaximilianSoerenPollak]

2nd attempt at the PR. Comment from old one:

Added both hours and date to both export types.
Choose the 'string' datatype as that makes it easiest to fit in the way the project is structured.

date -> 'DD-MM-YY' -> '03-04-2020'
hours -> 3.45 # uses the 'fmtHours' function
Both flags are optional and by default disabled.

Build successfully with 'make VERSION=0.0.8' and tested both outputs with the optional flags. -> Output as desired.

Let me know if any other changes are requiered or wanted, and I adapt as needed.

This should close #32

[MaximilianSoerenPollak]

Nope.. it does not let me push the code without it completly formatting. I'm sorry. I can't then do a PR.

My apologies.

If you still want to see the changes and commit them yourself you can view the PR by 'ignorign Whitespace' in the GIthub viewer.
Or just copy the code underneath.

-> Define hours & date argument variables
rootCmd.go

//...
var exportHours bool 
var exportDate bool 
//...

-> Add Date & Hours to the entry struct
-> Add 'SetDateFromBegin' function

entry.go

type Entry struct {
//...
Date string `json:"date,omitempty"`
Hours string`json:"hours,omitempty"`
//...
}

func (entry *Entry) SetDateFromBegin() {
entry.Date = entry.Begin.Format("02-03-2006") // DD-MM-YYYY
} 

-> Add hours & dates to the arguments
-> Add addtional information to the output if wanted

exportCmd.go

//...
if exportHours || exportDate {
	var addedInformationEntries []Entry
	for _, v := range filteredEntries {
		if exportHours {
			v.Hours = fmtHours(v.GetDuration())
		}
		if exportDate {
			v.SetDateFromBegining()
		}
		addedInformationEntries = append(addedInformationEntries, v)
	}
	// Reasignment here so we don't need to check other flags later
	filteredEntries = addedInformationEntries
}
//...
exportCmd.Flags().BoolVar(&exportDate, "date", false, "Add the 'date' field to the export")
exportCmd.Flags().BoolVar(&exportHours, "hours-decimal", false, "Add an 'hours' field calculated with '--decimal' to the export")
//...

And lastly in tyme.go add the 'Hours & Date` to the struct & the intialisation.

I hope this helps at bit at least.