Update README.md

Author: martoc

README.md

@@ -1,5 +1,7 @@
 [![build](https://github.com/martoc/gcp-kafka-auth-handler/actions/workflows/main.yml/badge.svg)](https://github.com/martoc/gcp-kafka-auth-handler/actions/workflows/main.yml)
 [![Go Report Card](https://goreportcard.com/badge/github.com/martoc/gcp-kafka-auth-handler)](https://goreportcard.com/report/github.com/martoc/gcp-kafka-auth-handler)
+![Go Version](https://img.shields.io/github/go-mod/go-version/martoc/gcp-kafka-auth-handler/main)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
 # gcp-kafka-auth-handler