docs(README): use shields.io for badges

README.md

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-# 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/badge/license-MIT-blue.svg)](https://github.com/ayntgl/discordo/blob/master/LICENSE) [![Go Report Card](https://goreportcard.com/badge/github.com/ayntgl/discordo)](https://goreportcard.com/report/github.com/ayntgl/discordo) [![discord](https://discordapp.com/api/guilds/903923641819992064/embed.png)](https://discord.gg/u49vegcfnh)
+# discordo · [![ci](https://img.shields.io/github/workflow/status/ayntgl/discordo/ci?color=5865F2&logo=github)](https://github.com/ayntgl/discordo/actions/workflows/ci.yml) [![license](https://img.shields.io/github/license/ayntgl/discordo?color=5865F2&logo=github)](https://github.com/ayntgl/discordo/blob/master/LICENSE) [![discord](https://img.shields.io/discord/903923641819992064?color=5865F2&logo=discord&logoColor=white)](https://discord.gg/u49vegcfnh)
 
 Discordo is a lightweight, secure, and feature-rich Discord terminal client. Heavily work-in-progress, expect breaking changes.