Fix broken build
Fix broken build

Make `rest/messages/generate-twiml-sms` non testable

TwilioDevEd/api-snippets,teoreteetik/api-snippets,TwilioDevEd/api-snippets,teoreteetik/api-snippets,teoreteetik/api-snippets,teoreteetik/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,teoreteetik/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,teoreteetik/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,teoreteetik/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,teoreteetik/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,teoreteetik/api-snippets