Add badge for MIT
## OpenFaaS - Serverless Functions Made Simple
[![Go Report Card](https://goreportcard.com/badge/github.com/openfaas/faas)](https://goreportcard.com/report/github.com/openfaas/faas) [![Build
-Status](https://travis-ci.org/openfaas/faas.svg?branch=master)](https://travis-ci.org/openfaas/faas) [![GoDoc](https://godoc.org/github.com/openfaas/faas?status.svg)](https://godoc.org/github.com/openfaas/faas)
+Status](https://travis-ci.org/openfaas/faas.svg?branch=master)](https://travis-ci.org/openfaas/faas) [![GoDoc](https://godoc.org/github.com/openfaas/faas?status.svg)](https://godoc.org/github.com/openfaas/faas) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
[![OpenFaaS](https://img.shields.io/badge/openfaas-serverless-blue.svg)](https://www.openfaas.com)
![OpenFaaS Logo](https://blog.alexellis.io/content/images/2017/08/faas_side.png)
