Make it possible to run npm format on Windows

With single-quoted paths, it fails with "No files matching the pattern
found."

Author: robinlinden

package.json

@@ -32,7 +32,7 @@
     "doc": "grunt jsdoc",
     "test": "nyc mocha",
     "report-coverage": "nyc report --reporter=text-lcov  > coverage.lcov && codecov",
-    "format": "prettier --write '**/*.js' '**/*.ts' '**/*.json'"
+    "format": "prettier --write \"**/*.js\" \"**/*.ts\" \"**/*.json\""
   },
   "dependencies": {
     "ffi-napi": "^4.0.3",