fix prepublish only script

Author: rwv

package.json

@@ -1,13 +1,14 @@
 {
   "name": "workbox-mirror-precache-plugin",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "A workbox plugin that fetch precache files from various mirrors.",
   "main": "lib/index.js",
   "module": "lib/index.js",
   "types": "lib/index.d.ts",
   "type": "module",
   "packageManager": "[email protected]",
   "scripts": {
+    "prepublishOnly": "npm run build",
     "build": "tsc",
     "test": "echo \"Error: no test specified\" && exit 1"
   },