[doc] Fix badge link to godoc

Author: g3force

README.md

@@ -1,6 +1,6 @@
 ![travis build](https://travis-ci.org/RoboCup-SSL/ssl-game-controller.svg?branch=master "travis build status")
 [![Go Report Card](https://goreportcard.com/badge/github.com/RoboCup-SSL/ssl-game-controller?style=flat-square)](https://goreportcard.com/report/github.com/RoboCup-SSL/ssl-game-controller)
-[![Go Doc](https://img.shields.io/badge/godoc-reference-blue.svg?style=flat-square)](http://godoc.org/github.com/RoboCup-SSL/ssl-game-controller)
+[![Go Doc](https://img.shields.io/badge/godoc-reference-blue.svg?style=flat-square)](https://godoc.org/github.com/RoboCup-SSL/ssl-game-controller/internal/app/controller)
 [![Release](https://img.shields.io/github/release/golang-standards/project-layout.svg?style=flat-square)](https://github.com/RoboCup-SSL/ssl-game-controller/releases/latest)
 
 # ssl-game-controller