docs(README): add goreportcard badge

README.md

@@ -1,4 +1,4 @@
-# discordo · [![ci](https://github.com/ayntgl/discordo/actions/workflows/ci.yml/badge.svg)](https://github.com/ayntgl/discordo/actions/workflows/ci.yml) [![license](https://img.shields.io/github/license/ayntgl/discordo?logo=github)](https://github.com/ayntgl/discordo/blob/master/LICENSE)
+# discordo · [![ci](https://github.com/ayntgl/discordo/actions/workflows/ci.yml/badge.svg)](https://github.com/ayntgl/discordo/actions/workflows/ci.yml) [![Go Report Card](https://goreportcard.com/badge/github.com/ayntgl/discordo)](https://goreportcard.com/report/github.com/ayntgl/discordo) [![license](https://img.shields.io/github/license/ayntgl/discordo?logo=github)](https://github.com/ayntgl/discordo/blob/master/LICENSE)
 
 Discordo is a lightweight, secure, and feature-rich Discord terminal client. Heavily work-in-progress, expect breaking changes.