message: [now-cli] Changed scale error message
  The error message does not give a clear reason of why it failed
diff: @@ -239,7 +239,7 @@ export default async function main(ctx) {
  return 1;
  }
  if (deployment.version === 2) {
  - output.error('Cannot scale a deployment containing builds');
  + output.error('Cannot scale a Now 2.0 deployment');
  now.close();
  return 1;
  }
  