Fix CI badge

Author: slonopotamus

README.adoc

@@ -10,7 +10,7 @@ Marat Radchenko <marat@slonopotamus.org>
 
 image:https://img.shields.io/badge/zulip-join_chat-brightgreen.svg[project chat,link=https://asciidoctor.zulipchat.com/]
 image:https://img.shields.io/gem/v/{project-handle}.svg[Latest Release,link={uri-gem}]
-image:{uri-project}/workflows/CI/badge.svg?branch=main[Build Status,link={uri-ci}]
+image:{uri-project}/actions/workflows/ci.yml/badge.svg?branch=main[Build Status,link={uri-ci}]
 
 {project-name} is an Asciidoctor extension for converting AsciiDoc documents directly to the FB2 e-book format.