Add Travis badge

README.md

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 # Deployment Manager
 
-[![Go Report Card](http://goreportcard.com/badge/kubernetes/deployment-manager)](http://goreportcard.com/report/kubernetes/deployment-manager)
+[![Build Status](https://travis-ci.org/kubernetes/deployment-manager.svg?branch=master)](https://travis-ci.org/kubernetes/deployment-manager) [![Go Report Card](http://goreportcard.com/badge/kubernetes/deployment-manager)](http://goreportcard.com/report/kubernetes/deployment-manager)
 
 Deployment Manager (DM) `dm` makes it easy to create, describe, update and
 delete Kubernetes resources using declarative configuration. A configuration is