record single task states transition and add them in timeline

Entity/AbstractTask.php

@@ -86,6 +86,11 @@ abstract class AbstractTask implements HasScopeInterface, HasCenterInterface
      * @ORM\Column(name="closed", type="boolean", options={ "default"=false })
      */
     private $closed = false;
+    
+    public function __construct()
+    {
+        
+    }
 
     /**
      * Set type