upgrade ts in the template file

Author: alexandr-g

template.json

@@ -27,7 +27,7 @@
       "redux": "4.0.5",
       "redux-devtools-extension": "2.13.8",
       "redux-mock-store": "1.5.4",
-      "typescript": "~3.8.0"
+      "typescript": "~3.9.0"
     },
     "scripts": {
       "lint": "eslint --ext .js,.jsx,.ts,.tsx ./",