namecheap: Send it as POST

src/dns/namecheap.js

@@ -16,6 +16,7 @@ var assert = require('assert'),
     debug = require('debug')('box:dns/namecheap'),
     dns = require('../native-dns.js'),
     domains = require('../domains.js'),
+    querystring = require('querystring'),
     safe = require('safetydance'),
     superagent = require('superagent'),
     sysinfo = require('../sysinfo.js'),
@@ -113,7 +114,10 @@ function setZone(dnsConfig, zoneName, hosts, callback) {
             }
         });
 
-        superagent.post(ENDPOINT).query(query).end(function (error, result) {
+        // namecheap recommends sending as POSTDATA with > 10 records
+        const qs = querystring.stringify(query);
+
+        superagent.post(ENDPOINT).set('Content-Type', 'application/x-www-form-urlencoded').send(qs).end(function (error, result) {
             if (error) return callback(new BoxError(BoxError.EXTERNAL_ERROR, error));
 
             var parser = new xml2js.Parser();