align method arity with expected

Author: AlexanderZagaynov

lib/concurrent/executor/simple_executor_service.rb

@@ -91,7 +91,7 @@ def wait_for_termination(timeout = nil)
 
     private
 
-    def ns_initialize
+    def ns_initialize(*args)
       @running = Concurrent::AtomicBoolean.new(true)
       @stopped = Concurrent::Event.new
       @count = Concurrent::AtomicFixnum.new(0)