NativeScript `tns preview`

[avhetman]

I'm submitting a ... (check one with "x")

[ ] bug report => search github for a similar issue or PR before submitting
[x] feature request
[ ] support request => Please do not submit support request here, instead see use [gitter](https://gitter.im/mgechev/angular2-seed) or [stackoverflow](https://stackoverflow.com/questions/tagged/angular2)

Current behavior
Going to the nativescript directory and running tns preview created the QR Code, but when I open it with NativeScript Playground and Preview I get a something went wront... promp.

Expected behavior
It would be nice if we could use the preview feature if possible. I was hoping to view the iOS app on my phone via preview.

Minimal reproduction of the problem with instructions
cd into nativescript folder, run tns preview then scan the QR code with NativeScript Playground App

What is the motivation / use case for changing the behavior?
When I played around with the NativeScript code, this was a really neat feature that made developing easy; changes would automatically be picked up in the app on my phone.

Please tell us about your environment:
MacBook running Mojave, iPhone X

• Angular Seed Version: aaaaf75
  Not sure, downloaded latest on Nov 16 2018

• Node: node --version =
  8.9.4