chore: add discord badge in the readmes

Author: art049

README.md

@@ -3,6 +3,7 @@
 
 [![CI](https://github.com/CodSpeedHQ/codspeed-rust/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/CodSpeedHQ/codspeed-rust/actions/workflows/ci.yml)
 [![Crates.io](https://img.shields.io/crates/v/cargo-codspeed)](https://crates.io/keywords/codspeed)
+[![Discord](https://img.shields.io/badge/chat%20on-discord-7289da.svg)](https://discord.com/invite/MxpaCfKSqF)
 
 </div>
 

crates/bencher_compat/README.md

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 [![CI](https://github.com/CodSpeedHQ/codspeed-rust/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/CodSpeedHQ/codspeed-rust/actions/workflows/ci.yml)
 [![Crates.io](https://img.shields.io/crates/v/codspeed-bencher-compat)](https://crates.io/crates/codspeed-bencher-compat)
+[![Discord](https://img.shields.io/badge/chat%20on-discord-7289da.svg)](https://discord.com/invite/MxpaCfKSqF)
 
 Bencher compatibility layer for CodSpeed
 

crates/cargo-codspeed/README.md

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 [![CI](https://github.com/CodSpeedHQ/codspeed-rust/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/CodSpeedHQ/codspeed-rust/actions/workflows/ci.yml)
 [![Crates.io](https://img.shields.io/crates/v/cargo-codspeed)](https://crates.io/crates/cargo-codspeed)
+[![Discord](https://img.shields.io/badge/chat%20on-discord-7289da.svg)](https://discord.com/invite/MxpaCfKSqF)
 
 A cargo subcommand for running CodSpeed on your project
 

crates/codspeed/README.md

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 [![CI](https://github.com/CodSpeedHQ/codspeed-rust/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/CodSpeedHQ/codspeed-rust/actions/workflows/ci.yml)
 [![Crates.io](https://img.shields.io/crates/v/codspeed)](https://crates.io/crates/codspeed)
+[![Discord](https://img.shields.io/badge/chat%20on-discord-7289da.svg)](https://discord.com/invite/MxpaCfKSqF)
 
 The core library used to integrate with Codspeed runners
 

crates/criterion_compat/README.md

@@ -3,6 +3,7 @@
 
 [![CI](https://github.com/CodSpeedHQ/codspeed-rust/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/CodSpeedHQ/codspeed-rust/actions/workflows/ci.yml)
 [![Crates.io](https://img.shields.io/crates/v/codspeed-criterion-compat)](https://crates.io/crates/codspeed-criterion-compat)
+[![Discord](https://img.shields.io/badge/chat%20on-discord-7289da.svg)](https://discord.com/invite/MxpaCfKSqF)
 
 Criterion.rs compatibility layer for CodSpeed