docs(README): fix Go report card badge

Author: mboersma

README.md

@@ -1,7 +1,7 @@
 # Deis Logger
 [![Build Status](https://travis-ci.org/deis/logger.svg?branch=master)](https://travis-ci.org/deis/logger)
 [![codecov.io](https://codecov.io/github/deis/logger/coverage.svg?branch=master)](https://codecov.io/github/deis/logger?branch=master)
-[![Go Report Card](http://goreportcard.com/badge/deis/logger)](http://goreportcard.com/report/deis/logger)
+[![Go Report Card](https://goreportcard.com/badge/github.com/deis/logger)](https://goreportcard.com/report/github.com/deis/logger)
 [![Docker Repository on Quay](https://quay.io/repository/deis/logger/status "Docker Repository on Quay")](https://quay.io/repository/deis/logger)
 
 Deis (pronounced DAY-iss) is an open source PaaS that makes it easy to deploy and manage