Update README.md from Go Port adding go reference
# Go Port
-[![Go Report Card](https://goreportcard.com/badge/github.com/metacall/core)](https://goreportcard.com/report/github.com/metacall/core)
+[![PkgGoDev](https://pkg.go.dev/badge/github.com/metacall/core/source/ports/go_port/source)](https://pkg.go.dev/github.com/metacall/core/source/ports/go_port/source) [![Go Report Card](https://goreportcard.com/badge/github.com/metacall/core)](https://goreportcard.com/report/github.com/metacall/core)
This project implements a wrapper of MetaCall API for Go.
