added the mDNS options to the example config

bin/goldilocks.js

@@ -73,9 +73,11 @@ function readConfigAndRun(args) {
   if (!config.dns) {
     config.dns = { modules: { name: 'proxy', port: 3053 } };
   }
-  if (!config.mdns) {
-    config.mdns = { port: 5353, broadcast: '224.0.0.251', ttl: 300 };
-  }
+  // Use Object.assign to add any properties needed but not defined in the mdns config.
+  // It will first copy the defaults into an empty object, then copy any real config over that.
+  var mdnsDefaults = { port: 5353, broadcast: '224.0.0.251', ttl: 300 };
+  config.mdns = Object.assign({}, mdnsDefaults, config.mdns || {});
+
   if (!config.tcp) {
     config.tcp = {};
   }

goldilocks.example.yml

@@ -52,3 +52,9 @@ http:
       domains:
         - '*.localhost.daplie.me'
       root: '/srv/www/:hostname'
+
+mdns:
+  disabled: false
+  port: 5353
+  broadcast: '224.0.0.251'
+  ttl: 300