regex_lexer.rb in rouge-3.3.0

- old
+ new

@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*- #
+# frozen_string_literal: true
 
 module Rouge
   # @abstract
   # A stateful lexer that uses sets of regular expressions to
   # tokenize a string.  Most lexers are instances of RegexLexer.