fix: unify the TypeScript version with the Angular App (trying to fix the CI)

Author: DimitarTachev

demo/TypeScriptApp/package.json

@@ -28,7 +28,7 @@
     "mochawesome": "~3.1.2",
     "nativescript-dev-appium": "next",
     "nativescript-dev-webpack": "next",
-    "typescript": "~3.2.2",
+    "typescript": "~3.4.1",
     "node-sass": "^4.12.0"
   },
   "scripts": {