Remove Discord badge

Author: thebrandonlucas

README.md

@@ -13,7 +13,6 @@
     <a href="https://github.com/payjoin/rust-payjoin/actions/workflows/rust.yml"><img alt="CI Status" src="https://github.com/payjoin/rust-payjoin/actions/workflows/rust.yml/badge.svg"></a>
     <a href="https://coveralls.io/github/payjoin/rust-payjoin?branch=master"><img src="https://coveralls.io/repos/github/payjoin/rust-payjoin/badge.svg?branch=master"/></a>
     <a href="https://blog.rust-lang.org/2022/08/11/Rust-1.63.0.html"><img alt="Rustc Version 1.63.0+" src="https://img.shields.io/badge/rustc-1.63.0%2B-lightgrey.svg"/></a>
-    <a href="https://discord.gg/XgFZstSJ"><img alt="Chat on Discord" src="https://img.shields.io/discord/1120791584674435134?logo=discord"></a>
   </p>
 
   <h4>