chore(package.json): update npm script

Author: exuanbo

package.json

@@ -6,6 +6,7 @@
   "main": "lib/main.js",
   "scripts": {
     "build": "tsc",
+    "format": "prettier-standard --format",
     "package": "ncc build --source-map --license licenses.txt",
     "test": "jest",
     "all": "npm run build && npm run format && npm run lint && npm run package && npm test"