Guardfile in rambling-trie-1.0.3 vs Guardfile in rambling-trie-2.0.0

@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 # A sample Guardfile
 # More info at https://github.com/guard/guard#readme
 
 guard 'rspec', cmd: 'rspec', all_on_start: true, all_after_pass: false do
   watch(%r{^spec/.+_spec\.rb$})
   watch(%r{^lib/(.+)\.rb$})     { |m| "spec/lib/#{m[1]}_spec.rb" }
-  watch('spec/spec_helper.rb')  { "spec" }
+  watch('spec/spec_helper.rb')  { 'spec' }
 end