Added Go Reference badge to README.md

README.md

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 [![main GitHub Actions workflow](https://github.com/allenta/varnishmon/actions/workflows/main.yml/badge.svg)](../../actions/workflows/main.yml)
 [![latest GitHub Release](https://img.shields.io/github/v/release/allenta/varnishmon.svg)](../../releases)
 [![Go Report Card](https://goreportcard.com/badge/github.com/allenta/varnishmon)](https://goreportcard.com/report/github.com/allenta/varnishmon)
+[![Go Reference](https://pkg.go.dev/badge/github.com/allenta/varnishmon.svg)](https://pkg.go.dev/github.com/allenta/varnishmon)
 
 `varnishmon` is a utility inspired by the [classic `atop` tool](https://www.atoptool.nl). It periodically collects metrics from [Varnish Cache](https://varnish-cache.org) / [Varnish Enterprise](https://www.varnish-software.com/products/varnish-enterprise/) using the [`varnishstat` utility](https://varnish-cache.org/docs/trunk/reference/varnishstat.html), stores them in a [DuckDB](https://duckdb.org) database, and provides a simple built-in web interface for visualizing the timeseries data. **In summary, `varnishmon` is a tool designed to effortlessly record, visualize, and share `varnishstat` output with minimal setup.**