fix Fatal error: Declaration of Workbunny\WebmanCoroutine\Utils\Worke…

…r\AbstractWorker::initWorkers() must be compatible with Workerman\Worker::initWorkers(): void

support workerman 5.x:
fix Fatal error: Declaration of Workbunny\WebmanCoroutine\Utils\Worker\AbstractWorker::initWorkers() must be compatible with Workerman\Worker::initWorkers(): void

src/Utils/Worker/AbstractWorker.php

@@ -12,7 +12,7 @@
 abstract class AbstractWorker extends Worker
 {
     /** @inheritDoc */
-    protected static function initWorkers()
+    protected static function initWorkers(): void
     {
         foreach (static::$_workers as $worker) {
             // 加载__init__开头的初始化方法