Update expected messages.

src/client/lib/dnsmanager-client.cr

@@ -51,7 +51,11 @@ class DNSManager::Client < IPC
 	def user_domain_add(domain : String)
 		request = Request::NewDomain.new domain
 		send_now request
-		parse_message [ Response::Success ], read
+		parse_message [ Response::DomainAdded,
+		                Response::DomainAlreadyExists,
+		                Response::InvalidDomainName,
+		                Response::UnacceptableDomain
+		              ], read
 	end
 
 	# Remove a domain.