Correct badge syntax
<p align="center">
<a href="https://github.com/gleam-lang/gleam/releases"><img src="https://img.shields.io/github/release/gleam-lang/gleam" alt="GitHub release"></a>
- <a href="https://discord.gg/Fm8Pwmy"><img src="https://img.shields.io/discord/768594524158427167?color=blue" alt="Discord chat"]</a>
+ <a href="https://discord.gg/Fm8Pwmy"><img src="https://img.shields.io/discord/768594524158427167?color=blue" alt="Discord chat"></a>
<a><img src="https://github.com/gleam-lang/gleam/workflows/ci/badge.svg?branch=main"></a>
</p>
