Add nameserver rule

pythonwhois/__init__.py

@@ -65,6 +65,7 @@ grammar = {
 		'name_servers':		['(?P<val>[a-z]*d?ns[0-9]+([a-z]{3})?\.([a-z0-9-]+\.)+[a-z0-9]+)',
 					 '(?P<val>[a-z0-9-]+\.d?ns[0-9]*\.([a-z0-9-]+\.)+[a-z0-9]+)',
 					 '(?P<val>([a-z0-9-]+\.)+[a-z0-9]+)(\s+([0-9]{1,3}\.){3}[0-9]{1,3})',
+					 'nserver:\s*(?P<val>.+)\s*[\[]?',
 					 'DNS[0-9]+:\s*(?P<val>.+)',
 					 'ns[0-9]+:\s*(?P<val>.+)',
 					 '[^a-z0-9.-](?P<val>d?ns\.([a-z0-9-]+\.)+[a-z0-9]+)'],