Gemfile in second_level_cache-2.3.3 vs Gemfile in second_level_cache-2.4.0

@@ -1,5 +1,7 @@
-source 'https://rubygems.org'
+# frozen_string_literal: true
 
+source "https://rubygems.org"
+
 gemspec
 
-gem 'rails', '~> 5.1.0'
+gem "rails", "~> 5.2.0.rc"