docs: update CI badge

Author: azzamsa

README.md

@@ -4,7 +4,7 @@
 dig many at once.
 
 <a href="https://github.com/BiznetGIO/digs/actions/workflows/ci.yml">
-<img src="https://github.com/BiznetGIO/digs/workflows/ci/badge.svg">
+<img src="https://github.com/BiznetGIO/digs/actions/workflows/ci.yml/badge.svg">
 </a>
 <a href="https://crates.io/crates/digs">
 <img src="https://img.shields.io/crates/v/digs.svg">