Do not hang forever if not on a TTY

bin/now-deploy.js

@@ -607,6 +607,7 @@ async function sync(token) {
   const plan = await planPromise;
 
   if (plan.id === 'oss') {
+    if (isTTY) {
       info(
         `You are on the OSS plan. Your code will be made ${chalk.bold('public')}.`
       );
@@ -631,6 +632,12 @@ async function sync(token) {
         info(`You can upgrade by running ${cmd('now upgrade')}.`);
         return exit();
       }
+    } else if (!wantsPublic) {
+      let msg = '\nYou are on the OSS plan. Your code will be made public.';
+      msg += ' If you agree with that, please run again with --public.';
+      console.log(msg);
+      return exit(1);
+    }
   }
 
   if (now.syncAmount) {