Mutate the string

Author: rafaelfranca

lib/generators/release.rb

@@ -43,8 +43,8 @@ def before_generation
         run 'gem install bundler'
 
         patch 'Gemfile' do |contents|
-          contents.sub(/gem \"delayed_job\".*/, "# gem \"delayed_job\"")
-          contents.sub(/gem \"delayed_job_active_record\".*/, "# gem \"delayed_job_active_record\"")
+          contents.sub!(/gem \"delayed_job\".*/, "# gem \"delayed_job\"")
+          contents.sub!(/gem \"delayed_job_active_record\".*/, "# gem \"delayed_job_active_record\"")
         end
       end
     end