fix(sustainability): add link to funding

Author: softbeehive

README.md

@@ -1,6 +1,7 @@
 [![SWUbanner](https://raw.githubusercontent.com/vshymanskyy/StandWithUkraine/main/banner-direct.svg)](https://vshymanskyy.github.io/StandWithUkraine)
 
 # Vue Stripe.js
+### [**Become a sponsor** 💜](https://github.com/sponsors/softbeehive)
 
 [![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/ectoflow/vue-stripe-js/ci.yml?branch=main)](https://github.com/ectoflow/vue-stripe-js/actions)
 [![npm](https://img.shields.io/npm/v/vue-stripe-js)](https://www.npmjs.com/package/vue-stripe-js)