change default port to 3000

Author: ssyrota

server.js

@@ -1,6 +1,6 @@
 const express = require('express');
 const path = require('path');
-const port = process.env.PORT || 8080;
+const port = process.env.PORT || 3000;
 const app = express();
 app.use(express.static(__dirname));
 app.use(express.static(path.join(__dirname, 'build')));