Code change to match documentation.

Changed Whois.query to Whois.lookup to match client. Deprecated Whois.query. Fixed documentation to use Whois.whois in the code to match the descriptive text

I started playing around with the gem and noticed that the documentation called out to use Whois.lookup in the code sample which didn't actually exist. The text above it said use Whois.whois. So to match the earlier change from Client.query to Client.lookup. I changed Whois.query to Whois.lookup then added a deprecation for Whois.query.