Gandi DynDNS
To configure the script for your domain to update the Gandi entry just fill it
in with your Gandi key and secret.
```json
{
"key": "qH3Df29ysxdDaT8p7PWMRV8rVuU75EjHy",
"domain": "main-domain.eu",
"subdomain": "subdomain"
}
```
and save it as conf.json
Call the script regularly. It will try to avoid contacting external services as
much as possible.
Subdomain can also be a list of subdomains to set.