#137 com.au lookup in 4.2.2

[Eric Bolotin]

I tried to look up aussiemail.com.au and the lookup failed.

I modified whois.servers.net and added the line

'com.au' => 'whois.aunic.net',

under // Second level inside the file and now it works.

I don't know if this is the ideal fix but it seems to work.
BTW, phpwhois looks like a great tool.