dependency_installer.rb in rubygems-update-2.5.2

- old
+ new

@@ -1,4 +1,5 @@
+# frozen_string_literal: true
 require 'rubygems'
 require 'rubygems/dependency_list'
 require 'rubygems/package'
 require 'rubygems/installer'
 require 'rubygems/spec_fetcher'