Rename deprecated config

spec/rails_helper.rb

@@ -52,7 +52,7 @@ RSpec.configure do |config|
   # If you're not using ActiveRecord, or you'd prefer not to run each of your
   # examples within a transaction, remove the following line or assign false
   # instead of true.
-  config.use_transactional_fixtures = true
+  config.use_transactional_tests = true
 
   # You can uncomment this line to turn off ActiveRecord support entirely.
   # config.use_active_record = false