fix(angular): update typescript to version 4 for ng new (#303)

fixes #302

Author: macjohnny

src/ng-new/shared/_files/package.json

@@ -57,6 +57,6 @@
     "protractor": "~5.4.3",
     "ts-node": "~8.3.0",
     "tslint": "~6.1.0",
-    "typescript": "~3.9.0"
+    "typescript": "~4.0.0"
   }
 }