Quiet doesn't work

[Wonko52]

The command line option "-" or "--quiet" doesn't work. It displays the normal output.

# ./carddav2fb run -q
Downloading recent FRITZ!Box phonebook
Downloading vCard(s) from account xxx

Downloaded 489 vCard(s)
Downloaded 489 vCard(s) in total
Dissolving groups (e.g. iCloud)
Dissolved 0 group(s)
Filtering 489 vCard(s)
Filtered 0 vCard(s)
Contact without phone numbers will be skipped
...