Gemfile in trav3-0.2.2 vs Gemfile in trav3-0.2.3

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 # Specify your gem's dependencies in trav3.gemspec