message: Add prettier:fix npm script
  Run this to fix prettier errors from CI
diff: "build-tests": "webpack -d --config webpack.tests.config.js",
  "typedoc": "ts-node ./scripts/doc-snippets.ts && typedoc --options typedoc.json",
  "tslint": "tslint --project tsconfig.json",
  - "prettier": "prettier -l '**/*.ts' '**/*.tsx'"
  + "prettier": "prettier -l '**/*.ts' '**/*.tsx'",
  + "prettier:fix": "prettier --write '**/*.ts' '**/*.tsx'"
  },
  "engines": {
  "node": ">=9.11.1",
  