docs(readme): fix code of conduct link

Signed-off-by: Christina Sørensen <christina@cafkafk.com>

README.md

@@ -7,7 +7,7 @@ eza is a modern, maintained replacement for ls, built on [exa](https://github.co
 **README Sections:** [Options](#options) — [Installation](#installation) — [Development](#development)
 
 [![Built with Nix](https://img.shields.io/badge/Built_With-Nix-5277C3.svg?logo=nixos&labelColor=73C3D5)](https://nixos.org)
-[![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-2.1-4baaaa.svg)](code_of_conduct.md)
+[![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-2.1-4baaaa.svg)](CODE_OF_CONDUCT.md)
 <a href="https://matrix.to/#/#eza:gitter.im"><img alt="Gitter" src="https://img.shields.io/gitter/room/eza-community/eza?logo=element&link=https%3A%2F%2Fapp.gitter.im%2F%23%2Froom%2F%23eza%3Agitter.im&link=Gitter%20matrix%20room%20for%20Eza"></a>
 
 [![Unit tests](https://github.com/eza-community/eza/actions/workflows/unit-tests.yml/badge.svg)](https://github.com/eza-community/eza/actions/workflows/unit-tests.yml)