Merge pull request #2342 from atouchet/badges

Update build status badge

README.md

@@ -1,6 +1,6 @@
 # Serde   [![Build Status]][actions] [![Latest Version]][crates.io] [![serde: rustc 1.13+]][Rust 1.13] [![serde_derive: rustc 1.31+]][Rust 1.31]
 
-[Build Status]: https://img.shields.io/github/workflow/status/serde-rs/serde/CI/master
+[Build Status]: https://img.shields.io/github/actions/workflow/status/serde-rs/serde/ci.yml?branch=master
 [actions]: https://github.com/serde-rs/serde/actions?query=branch%3Amaster
 [Latest Version]: https://img.shields.io/crates/v/serde.svg
 [crates.io]: https://crates.io/crates/serde