Guardfile in serviceworker-rails-0.5.5 vs Guardfile in serviceworker-rails-0.6.0

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 # A sample Guardfile
 # More info at https://github.com/guard/guard#readme
 
 ## Uncomment and set this to only include directories you want to watch
 # directories %w(app lib config test spec features) \