added .de region specific support

You seem to query whois.denic.de for the .de TLD. Unfortunately no data is received by your module as you're lacking the ``-T dn,ace -C US-ASCII `` string _before_ the actually domain to query.

You can easily check the behaviour through
``echo "-T dn,ace -C US-ASCII test.de" | nc whois.denic.de 43`` and ``echo "test.de" | nc whois.denic.de 43``

Added domain ``test.de`` to test-cases as this very domain is unlikely to change over time due to the state-sponsored organisation behind.

Test-cases are green and I guess there is no need to print the whole output there considered the case that this change is a quite trivial one. I do hope you agree :smile: