Merge pull request #46 from zaitsev1393/server-listen-port-fix

Heroku deploy process PORT fix

Author: Gorniv

server.ts

@@ -35,7 +35,7 @@ const hash = mainFiles[0].split('.')[1];
 const { AppServerModuleNgFactory, LAZY_MODULE_MAP } = require(`./dist-server/main.${hash}`);
 import { ngExpressEngine } from '@nguniversal/express-engine';
 import { REQUEST, RESPONSE } from '@nguniversal/express-engine/tokens';
-const PORT = 4000;
+const PORT = process.env.PORT || 4000;
 
 enableProdMode();