Integer not accepted as keyboardType in TextField

**Environment**
 - CLI: 
 - Android Runtime: 6.3.0
 - iOS Runtime: 6.3.0
 - Plugin(s): -

**Describe the bug**
TextField with keyboardType="integer" crashes the application.

**To Reproduce**
Create TextField with keyboardType="integer"

**Expected behavior**
Keyboard without ability to add decimals

**Sample project**
https://play.nativescript.org/?template=play-ng&id=FlqpWD
