def process_after_callbacks(mentioner, mentionee)
        result = true
        @callbacks[:after].each do |callback|
          unless callback.call(mentioner, mentionee)
            result = false
            break
          end
        end
        result
      end
def process_after_callbacks(mentioner, mentionee)
        result = true
        @callbacks[:after].each do |callback|
          unless callback.call(mentioner, mentionee)
            result = false
            break
          end
        end
        result
      end
Process after callbacks

 @param [Mentioner] mentioner - the mentioner of the callback
 @param [Mentionee] mentionee - the mentionee of the callback