gemspec.rb in licensee-9.12.0

- old
+ new

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 module Licensee
   module Matchers
     class Gemspec < Licensee::Matchers::Package
       # a value is a string surrounded by any amount of whitespace
       # optionally ended with (non-captured) ".freeze"