ddns-scripts: new service "spdns.de"

Service provided by Securepoint GmbH, 21335 Lüneburg, Germany
Info at http://www.spdns.de

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

net/ddns-scripts/files/usr/lib/ddns/services

@@ -63,3 +63,6 @@
 
 # Mythic Beasts (https://www.mythic-beasts.com) Dynamic DNS
 "mythic-beasts.com"	"http://dnsapi4.mythic-beasts.com/?domain=[USERNAME]&password=[PASSWORD]&command=REPLACE%20[DOMAIN]%2060%20A%20DYNAMIC_IP"
+
+# Securepoint Dynamic-DNS-Service	(http://www.spdns.de)
+"spdns.de"	"http://[USERNAME]:[PASSWORD]@update.spdns.de/nic/update?hostname=[DOMAIN]&myip=[IP]"