Fix server.py

Author: Steven Normore

server.py

@@ -13,7 +13,7 @@ def do_GET(self):
         self.wfile.write(msg.encode())
 
 
-port = os.getenv('PORT', 80)
+port = int(os.getenv('PORT', 80))
 print('Listening on port %s' % (port))
 httpd = socketserver.TCPServer(('', port), Handler)
 httpd.serve_forever()