Imported from gist joshooaj which have a hard-coded support for DynuDNS.

As the script uses PoshACME which in its turn support a plethora of DDNS providers i aim to update it to support the other DDNS providers a bit easier.

Also adding other dependencies for DDNS update as PoshACME does not support auto-updates for the DDNS providers.

Also nice to have everything collected on one site wehere you could file issues, discuss or contribute to it easier.