restore removed dep

Author: glasnt

getting-started/bookshelf/config/application.rb

@@ -25,6 +25,7 @@
 # require "action_cable/engine"
 require "sprockets/railtie"
 require "rails/test_unit/railtie"
+require "google/cloud/error_reporting/rails"
 
 # Require the gems listed in Gemfile, including any gems
 # you've limited to :test, :development, or :production.