Update README.md (#431)

Remove discord link

Signed-off-by: Daniele Salvatore Albano <danielealbano@users.noreply.github.com>

README.md

@@ -2,7 +2,6 @@
 [![Build & Test](https://github.com/danielealbano/cachegrand/actions/workflows/build_and_test.yml/badge.svg)](https://github.com/danielealbano/cachegrand/actions/workflows/build_and_test.yml)
 [![codecov](https://codecov.io/gh/danielealbano/cachegrand/branch/main/graph/badge.svg?token=H4W0N0F7MT)](https://codecov.io/gh/danielealbano/cachegrand)
 [![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fdanielealbano%2Fcachegrand.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2Fdanielealbano%2Fcachegrand?ref=badge_shield)
-[![Discord](https://img.shields.io/discord/1051658969556455526?&label=discord&logoColor=white&logo=discord)](https://discord.gg/RVwE9kmdgV)
 
 <p align="center">
   <a href="https://cachegrand.io">