Gemfile in sentry-delayed_job-5.20.1 vs Gemfile in sentry-delayed_job-5.21.0

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