fix clean

clean.js

@@ -81,7 +81,7 @@ const start = async (job, done) => {
     process.on('uncaughtException', beforeExit);
     process.on('unhandledRejection', beforeExit);
     typeof process.send === 'function' && process.send('子进程开始执行mine');
-    clean(job, done);
+    await clean(job, done);
     typeof process.send === 'function' && process.send('子进程mine执行完毕');
     process.exit();
 };