bullet.gemspec in bullet-5.7.4 vs bullet.gemspec in bullet-5.7.5

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 lib = File.expand_path('../lib/', __FILE__)
 $LOAD_PATH.unshift lib unless $LOAD_PATH.include?(lib)
 
 require 'bullet/version'