docs: update pkg.go.dev reference

Author: d-Rickyy-b

README.md

@@ -3,6 +3,7 @@
 # Certstream Server Go
 [![build](https://github.com/d-Rickyy-b/certstream-server-go/actions/workflows/release_build.yml/badge.svg)](https://github.com/d-Rickyy-b/certstream-server-go/actions/workflows/release_build.yml)
 [![Docker Image Version (latest semver)](https://img.shields.io/docker/v/0rickyy0/certstream-server-go?label=docker&sort=semver)](https://hub.docker.com/repository/docker/0rickyy0/certstream-server-go)
+[![Go Reference](https://pkg.go.dev/badge/github.com/d-Rickyy-b/certstream-server-go.svg)](https://pkg.go.dev/github.com/d-Rickyy-b/certstream-server-go)
 
 This project aims to be a drop-in replacement for the [official certstream server](https://github.com/CaliDog/certstream-server/) by Calidog. This tool aggregates, parses, and streams certificate data from multiple [certificate transparency logs](https://www.certificate-transparency.org/what-is-ct) via websocket connections to the clients.