chore(package): add funding link

Author: nklayman

package.json

@@ -4,6 +4,7 @@
   "description": "A Vue Cli 3 plugin for Electron with no required configuration",
   "main": "index.js",
   "homepage": "https://nklayman.github.io/vue-cli-plugin-electron-builder/",
+  "funding": "https://github.com/sponsors/nklayman",
   "scripts": {
     "test": "jest",
     "test:docker": "docker build -t vcpeb . && docker run -t --rm --name vcpeb vcpeb",