chore: remove gitter badge from README

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Co-Authored-By: Claude <[email protected]>

Author: appleboy

README.md

@@ -4,7 +4,6 @@
 [![Trivy Security Scan](https://github.com/gin-contrib/zap/actions/workflows/trivy-scan.yml/badge.svg)](https://github.com/gin-contrib/zap/actions/workflows/trivy-scan.yml)
 [![Go Report Card](https://goreportcard.com/badge/github.com/gin-contrib/zap)](https://goreportcard.com/report/github.com/gin-contrib/zap)
 [![GoDoc](https://godoc.org/github.com/gin-contrib/zap?status.svg)](https://godoc.org/github.com/gin-contrib/zap)
-[![Join the chat at https://gitter.im/gin-gonic/gin](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/gin-gonic/gin)
 
 Alternative logging through [zap](https://github.com/uber-go/zap). Thanks for [Pull Request](https://github.com/gin-gonic/contrib/pull/129) from [@yezooz](https://github.com/yezooz)