README: fix travis link

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>

README.md

@@ -2,7 +2,7 @@
 
 [![Go Report Card](https://goreportcard.com/badge/github.com/etcd-io/etcd?style=flat-square)](https://goreportcard.com/report/github.com/etcd-io/etcd)
 [![Coverage](https://codecov.io/gh/etcd-io/etcd/branch/master/graph/badge.svg)](https://codecov.io/gh/etcd-io/etcd)
-[![Build Status Travis](https://img.shields.io/travis/etcd-io/etcdlabs.svg?style=flat-square&&branch=master)](https://travis-ci.org/etcd-io/etcd)
+[![Build Status Travis](https://img.shields.io/travis/etcd-io/etcdlabs.svg?style=flat-square&&branch=master)](https://travis-ci.com/etcd-io/etcd)
 [![Build Status Semaphore](https://semaphoreci.com/api/v1/etcd-io/etcd/branches/master/shields_badge.svg)](https://semaphoreci.com/etcd-io/etcd)
 [![Docs](https://readthedocs.org/projects/etcd/badge/?version=latest&style=flat-square)](https://etcd.readthedocs.io/en/latest/?badge=latest)
 [![Godoc](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](https://godoc.org/github.com/etcd-io/etcd)