Change the CI file name reference in README.md.

README.md

@@ -7,7 +7,7 @@
 [![Xi Zulip](https://img.shields.io/badge/Xi%20Zulip-%23xilem-blue?logo=Zulip)](https://xi.zulipchat.com/#narrow/stream/354396-xilem)
 [![dependency status](https://deps.rs/repo/github/linebender/xilem/status.svg)](https://deps.rs/repo/github/linebender/xilem)
 [![Apache 2.0](https://img.shields.io/badge/license-Apache-blue.svg)](#license)
-[![Build Status](https://github.com/linebender/xilem/actions/workflows/rust.yml/badge.svg)](https://github.com/linebender/xilem/actions)
+[![Build Status](https://github.com/linebender/xilem/actions/workflows/ci.yml/badge.svg)](https://github.com/linebender/xilem/actions)
 <!-- [![Crates.io](https://img.shields.io/crates/v/xilem.svg)](https://crates.io/crates/xilem) -->
 <!-- [![Docs](https://docs.rs/xilem/badge.svg)](https://docs.rs/xilem) -->