      Sends the a block to be run asynchronously on a queue with a quality of service of QOS_CLASS_UTILITY.
 
      - parameters:
-     - after: After how many seconds the block should be run.
-     - block: The block that is to be passed to be run on queue
+        - after: After how many seconds the block should be run.
+        - block: The block that is to be passed to be run on queue
 
      - returns: An `Async` struct
 

     Sends the a block to be run asynchronously on a custom queue.

     - parameters:
     - after: After how many seconds the block should be run.
     - block: The block that is to be passed to be run on the queue

     - returns: An `Async` struct


    // MARK: - Private properties and init

    /**
     Private property to hold internally on to a `dispatch_block_t`
    */
    private let block: dispatch_block_t

