#81 Include detected IP in failure mail notification

[thebodzio]

Recently I received an email from one of the routers I manage. It was a notification about failure to update dynamic DNS service. Normally I'd just log in to the router via SSH and investigate further (it's a remote machine) but unfortunately there was no current IP included in the message, which is obviously a bummer.

Could you please condsider adding an option to include detected IP in failure email messages sent by ddclient? Alternatively, this IP could be included by default. It would be most convenient in such situations like the one described above. Without it I'm in the dark until next (hopefully) successful update.