fix: update CI badge to use dev branch

Author: rodrigogs

README.md

@@ -10,7 +10,7 @@
 
 <p align="center">
   <a href="https://github.com/rodrigogs/whats-reader/releases/latest"><img src="https://img.shields.io/github/v/release/rodrigogs/whats-reader?style=flat-square&color=blue" alt="Latest Release" /></a>
-  <a href="https://github.com/rodrigogs/whats-reader/actions/workflows/ci.yml"><img src="https://img.shields.io/github/actions/workflow/status/rodrigogs/whats-reader/ci.yml?branch=main&style=flat-square&label=CI" alt="CI Status" /></a>
+  <a href="https://github.com/rodrigogs/whats-reader/actions/workflows/ci.yml"><img src="https://img.shields.io/github/actions/workflow/status/rodrigogs/whats-reader/ci.yml?branch=dev&style=flat-square&label=CI" alt="CI Status" /></a>
   <a href="https://github.com/rodrigogs/whats-reader/blob/main/LICENSE"><img src="https://img.shields.io/github/license/rodrigogs/whats-reader?style=flat-square" alt="License" /></a>
 </p>