docs: fix invalid urls

Fixes: kata-containers#391

Replace invalid urls with new legal ones.

Signed-off-by: Zhang Wei <zhangwei555@huawei.com>

README.md

@@ -1,5 +1,5 @@
 [![Build Status](https://travis-ci.org/kata-containers/runtime.svg?branch=master)](https://travis-ci.org/kata-containers/runtime)
-[![Build Status](http://kata-jenkins-ci.westus2.cloudapp.azure.com/job/kata-containers-runtime-ubuntu-16-04-master/badge/icon)](http://kata-jenkins-ci.westus2.cloudapp.azure.com/job/kata-containers-runtime-ubuntu-16-04-master/)
+[![Build Status](http://jenkins.katacontainers.io/job/kata-containers-runtime-ubuntu-16-04-master/badge/icon)](http://jenkins.katacontainers.io/job/kata-containers-runtime-ubuntu-16-04-master/)
 [![Go Report Card](https://goreportcard.com/badge/github.com/kata-containers/runtime)](https://goreportcard.com/report/github.com/kata-containers/runtime)
 [![GoDoc](https://godoc.org/github.com/kata-containers/runtime?status.svg)](https://godoc.org/github.com/kata-containers/runtime)