thread.rb in async-container-0.16.1

- old
+ new

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 # Copyright, 2020, by Samuel G. D. Williams. <http://www.codeotaku.com>
 # 
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
 # in the Software without restriction, including without limitation the rights