Added IPv6 suppport and config files

nsupdate.d/sample.config.dist

@@ -0,0 +1,17 @@
+# nsupdate.config
+
+# from which site should we get your wan ip?
+IP_CHECK_SITE="http://ip.dblx.io"
+
+# use drill instead of nslookup for hostname lookup
+USE_DRILL="YES"
+IPV6="NO"
+
+# Login credentials for the inwx admin interface
+INWX_USER="USERNAME"
+INWX_PASS="PASSWORD"
+
+# The hostname that you want to update and it's ID from the inwx interface
+# You get the ID when you edit the given nameserver entry and hover the save button.
+DOMAIN="DOMAIN"
+INWX_DOMAIN_ID="123456789"