Fix tests on Windows

Author: wooorm

package.json

@@ -39,7 +39,7 @@
     "xo": "^0.21.1"
   },
   "scripts": {
-    "format": "remark . -qfo && prettier --write '**/*.js' && xo --fix",
+    "format": "remark . -qfo && prettier --write \"**/*.js\" && xo --fix",
     "test-api": "node test",
     "test-coverage": "nyc --reporter lcov tape test.js",
     "test": "npm run format && npm run test-coverage"