docs: Add codecov badge to readme

README.md

@@ -1,4 +1,4 @@
-rust-magic [![build status](https://github.com/robo9k/rust-magic/actions/workflows/build.yml/badge.svg)](https://github.com/robo9k/rust-magic/actions/workflows/linux.yml) [![Documentation](https://docs.rs/magic/badge.svg)](https://docs.rs/magic) [![REUSE status](https://api.reuse.software/badge/github.com/robo9k/rust-magic)](https://api.reuse.software/info/github.com/robo9k/rust-magic) [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/5709/badge)](https://bestpractices.coreinfrastructure.org/projects/5709) [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/robo9k/rust-magic/badge)](https://securityscorecards.dev/viewer/?uri=github.com/robo9k/rust-magic) 
+rust-magic [![build status](https://github.com/robo9k/rust-magic/actions/workflows/build.yml/badge.svg)](https://github.com/robo9k/rust-magic/actions/workflows/linux.yml) [![Documentation](https://docs.rs/magic/badge.svg)](https://docs.rs/magic) [![REUSE status](https://api.reuse.software/badge/github.com/robo9k/rust-magic)](https://api.reuse.software/info/github.com/robo9k/rust-magic) [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/5709/badge)](https://bestpractices.coreinfrastructure.org/projects/5709) [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/robo9k/rust-magic/badge)](https://securityscorecards.dev/viewer/?uri=github.com/robo9k/rust-magic) [![codecov](https://codecov.io/gh/robo9k/rust-magic/graph/badge.svg?token=YnazJQdLXI)](https://codecov.io/gh/robo9k/rust-magic) 
 ==========
 [libmagic](https://www.darwinsys.com/file/) bindings for [Rust](https://www.rust-lang.org/).