Merge pull request #2678 from r7kamura/rails-root-glob

Prefer `Pathname#glob` to `Dir.[]` at spec/rails_helper.rb template

lib/generators/rspec/install/templates/spec/rails_helper.rb

@@ -20,7 +20,7 @@
 # directory. Alternatively, in the individual `*_spec.rb` files, manually
 # require only the support files necessary.
 #
-# Dir[Rails.root.join('spec/support/**/*.rb')].sort.each { |f| require f }
+# Rails.root.glob('spec/support/**/*.rb').sort.each { |f| require f }
 
 <% if RSpec::Rails::FeatureCheck.has_active_record_migration? -%>
 # Checks for pending migrations and applies them before tests are run.