update doc ,ready to push to npm

lib/asyncTaskMgr.js

@@ -41,11 +41,12 @@ function asyncTaskMgr(){
                     while(tmpCb = task.callbackList.shift()){
                         tmpCb && tmpCb.apply(null,task.result);
                     }
-                    
                 }
             });
         }
     }
+
+    
 };
 
 module.exports = asyncTaskMgr;