Update README.md

README.md

@@ -129,11 +129,11 @@ $task->onWorkerStart = function($task)
     // 2.5 seconds
     $time_interval = 2.5; 
     $timer_id = Timer::add($time_interval, 
-         function()
-	 {
+        function()
+        {
             echo "Timer run\n";
-	 }
-     );
+        }
+    );
 };
 
 // run all workers