Update badges

Author: mxpv

README.md

@@ -5,6 +5,7 @@
 [![](https://github.com/mxpv/podsync/workflows/CI/badge.svg)](https://github.com/mxpv/podsync/actions?query=workflow%3ACI)
 [![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/mxpv/podsync)](https://github.com/mxpv/podsync/releases)
 [![Go Report Card](https://goreportcard.com/badge/github.com/mxpv/podsync)](https://goreportcard.com/report/github.com/mxpv/podsync)
+[![GitHub Sponsors](https://img.shields.io/github/sponsors/mxpv)](https://github.com/sponsors/mxpv)
 [![Patreon](https://img.shields.io/badge/support-patreon-E6461A.svg)](https://www.patreon.com/podsync)
 [![Twitter Follow](https://img.shields.io/twitter/follow/pod_sync?style=social)](https://twitter.com/pod_sync)