dns: add missing exports.BADNAME

Author: silverwind

lib/dns.js

@@ -331,6 +331,7 @@ exports.NOTIMP = 'ENOTIMP';
 exports.REFUSED = 'EREFUSED';
 exports.BADQUERY = 'EBADQUERY';
 exports.ADNAME = 'EADNAME';
+exports.BADNAME = 'EBADNAME';
 exports.BADFAMILY = 'EBADFAMILY';
 exports.BADRESP = 'EBADRESP';
 exports.CONNREFUSED = 'ECONNREFUSED';