Update server.js

server.js

@@ -4,7 +4,7 @@ var express        = require('express');
 var expressLayouts = require('express-ejs-layouts');
 var bodyParser     = require('body-parser');
 var app            = express();
-var port           = 8080;
+var port           = process.env.PORT || 8080;
 
 // use ejs and express layouts
 app.set('view engine', 'ejs');