fix: update react-scripts in template to latest

Author: alexandr-g

template.json

@@ -24,7 +24,7 @@
       "prettier": "1.19.1",
       "react-redux": "7.1.3",
       "react-router-dom": "5.1.2",
-      "react-scripts": "3.3.1",
+      "react-scripts": "3.4.0",
       "redux": "4.0.5",
       "redux-devtools-extension": "2.13.8",
       "redux-mock-store": "1.5.4",