config.ru in phobos_db_checkpoint-3.4.0

- old
+ new

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 require 'bundler/setup'
 require 'phobos_db_checkpoint'
 require 'phobos_db_checkpoint/events_api'
 require_relative './phobos_boot.rb'
 