style(docs): add line break after badge row

Improve README layout by separating badge rows.

Signed-off-by: umatare5 <umatare5@gmail.com>
AI-assisted-by: GitHub Copilot Coding Agent

Author: umatare5

README.md

@@ -14,7 +14,7 @@
     <img alt="GitHub Tag" src="https://img.shields.io/github/v/tag/umatare5/telee?label=Latest%20version" />
     <a href="https://github.com/umatare5/telee/actions/workflows/go-test-build.yml"><img alt="Test and Build" src="https://github.com/umatare5/telee/actions/workflows/go-test-build.yml/badge.svg?branch=main" /></a>
     <img alt="Test Coverage" src="docs/assets/coverage.svg" />
-    <a href="https://goreportcard.com/report/github.com/umatare5/telee"><img alt="Go Report Card" src="https://goreportcard.com/badge/github.com/umatare5/telee?style=flat-square" /></a>
+    <a href="https://goreportcard.com/report/github.com/umatare5/telee"><img alt="Go Report Card" src="https://goreportcard.com/badge/github.com/umatare5/telee?style=flat-square" /></a><br/>
     <a href="https://www.bestpractices.dev/projects/10968"><img alt="OpenSSF Best Practices" src="https://www.bestpractices.dev/projects/10968/badge" /></a>
     <a href="./LICENSE"><img alt="License: MIT" src="https://img.shields.io/badge/License-MIT-yellow.svg" /></a>
     <a href="https://developer.cisco.com/codeexchange/github/repo/umatare5/telee"><img alt="Published" src="https://static.production.devnetcloud.com/codeexchange/assets/images/devnet-published.svg" /></a>