Add exit code for server command

Author: mbabker

Command/ServerCommand.php

@@ -32,6 +32,7 @@ protected function configure()
     protected function execute(InputInterface $input, OutputInterface $output)
     {
         $output->writeln('<error>This command is deprecated and will be removed in v2, use gos:websocket:server instead</error>');
-        parent::execute($input, $output);
+
+        return parent::execute($input, $output);
     }
 }

Command/WebsocketServerCommand.php

@@ -76,5 +76,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             $input->getOption('port') === null ? $this->port : $input->getOption('port'),
             $input->getOption('profile')
         );
+
+        return 0;
     }
 }