Merge branch 'develop' of github.com:ndu2/gitlab-time-tracker into develop

Author: Andreas Müller

documentation.md

@@ -282,7 +282,7 @@ Defaults to `table`. `csv` and `markdown` can be printed to stdout, `pdf` and `x
 There are additional options for the invoice output as given in the following example:
 
 ```shell
-gtt report --output=invoice --file=invoice.md --from 2021-02-01 --to 2021-02-28 --closed  --invoiceCurrencyMaxUnit 1 --invoiceTitle "Rechnung" --invoiceAddress "Firma" "Mr. X" "Strasse" "10000 Ort" "Land" --invoiceCurrency "EUR" --invoiceCurrencyPerHour "50" --invoiceVAT "0.15" --invoiceDate "1.03.2021" --invoicePositionText "Position Text"
+gtt report --output=invoice --file=invoice.md --from 2021-02-01 --to 2021-02-28 --closed  --invoiceCurrencyMaxUnit 1 --invoiceTitle "Rechnung" --invoiceReference "Reference" --invoiceAddress "Firma" "Mr. X" "Strasse" "10000 Ort" "Land" --invoiceCurrency "EUR" --invoiceCurrencyPerHour "50" --invoiceVAT "0.15" --invoiceDate "1.03.2021" --invoicePositionText "Position Text"
 ```
 
 For paper invoice, further process the output with a css, see the folder preview (styles.css, invoice.pdf)