Make sure DatabaseCleaner.clean runs AFTER Capybara's cleanup

spec/support/db_cleaner.rb

@@ -15,7 +15,7 @@ RSpec.configure do |config|
     DatabaseCleaner.start
   end
 
-  config.after(:each) do
+  config.append_after(:each) do
     DatabaseCleaner.clean
   end
 end