Update Bundler require in getting started application

guides/code/getting_started/config/application.rb

@@ -2,8 +2,9 @@
 
 require 'rails/all'
 
-# Assets should be precompiled for production (so we don't need the gems loaded then)
-Bundler.require(*Rails.groups(assets: %w(development test)))
+# Require the gems listed in Gemfile, including any gems
+# you've limited to :test, :development, or :production.
+Bundler.require(:default, Rails.env)
 
 module Blog
   class Application < Rails::Application