replace socket.io usage with WebSockets

lib/mojang.js

@@ -1,6 +1,7 @@
 const request = require('request')
 
 const logger = require('./logger')
+const MessageOf = require('./message')
 
 const config = require('../config')
 
@@ -65,14 +66,12 @@ class MojangUpdater {
     if (this._hasUpdated) {
       this._hasUpdated = false
 
-      this._app.server.broadcast('updateMojangServices', this._services)
+      this._app.server.broadcast(MessageOf('updateMojangServices', this._services))
     }
   }
 
-  sendLastUpdate (client) {
-    if (this._services) {
-      client.emit('updateMojangServices', this._services)
-    }
+  getLastUpdate () {
+    return this._services
   }
 
   handleServiceUpdate (url, color) {