minor bugfix for browser use as per #10

dns.parser.js

@@ -210,6 +210,6 @@ pdns.unpack = function (ab) {
   header.byteLength = total;
   return header;
 };
-pdns.unpackRdata = require('./dns.rdata.parse.js').DNS_RDATA_PARSE;
+pdns.unpackRdata = exports.DNS_RDATA_PARSE || require('./dns.rdata.parse.js').DNS_RDATA_PARSE;
 
 }('undefined' !== typeof window ? window : exports));