README: replace github badge

Author: domenkozar

README.md

@@ -1,6 +1,6 @@
 # SecretSpec
 
-[![CI](https://github.com/cachix/secretspec/actions/workflows/ci.yml/badge.svg)](https://github.com/cachix/secretspec/actions/workflows/ci.yml)
+[![Build Status](https://img.shields.io/github/check-runs/cachix/secretspec/main)](https://github.com/cachix/secretspec/actions)
 [![Crates.io](https://img.shields.io/crates/v/secretspec)](https://crates.io/crates/secretspec)
 [![docs.rs](https://docs.rs/secretspec/badge.svg)](https://docs.rs/secretspec)
 [![Discord channel](https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fdiscord.com%2Fapi%2Finvites%2FnaMgvexb6q%3Fwith_counts%3Dtrue&query=%24.approximate_member_count&logo=discord&logoColor=white&label=Discord%20users&color=green&style=flat)](https://discord.gg/naMgvexb6q)