Feature request, optional timeout between checks

[kobbe]

For some reason the top level domain name '.nu' refuses multiple checks within some close to zero time limit. I noticed that it only works if the checks are approximately 1s between each other. A sleep option between the checks would be appreciated.

[eheydrick]

the whois gem is supposed to handle throttling and retires. We need to move to a newer version of the whois gem or open an issue to handle .nu better. https://github.com/weppos/whois