message: create-app: upgrade prettier version
  since we are using 2.x in backstage/backstage
diff: "@spotify/prettier-config": "^7.0.0",
  "concurrently": "^6.0.0",
  "lerna": "^4.0.0",
  - "prettier": "^1.19.1"
  + "prettier": "^2.3.2"
  },
  "prettier": "@spotify/prettier-config",
  "lint-staged": {
  