Fix invalid SWOOLE_PROCESS value

Author: m3m0r7

src/Server/helpers.php

@@ -18,5 +18,5 @@ function swoole_cpu_num(): int
 }
 
 if (! defined('SWOOLE_PROCESS')) {
-    define('SWOOLE_PROCESS', 3);
+    define('SWOOLE_PROCESS', 2);
 }