Set build badge to use kubevirt prow ci
# KubeVirt
-[![Build Status](https://travis-ci.org/kubevirt/kubevirt.svg?branch=main)](https://travis-ci.org/kubevirt/kubevirt)
+[![Build Status](https://prow.ci.kubevirt.io/badge.svg?jobs=push-kubevirt-main)](https://prow.ci.kubevirt.io/?job=push-kubevirt-main)
[![Go Report Card](https://goreportcard.com/badge/github.com/kubevirt/kubevirt)](https://goreportcard.com/report/github.com/kubevirt/kubevirt)
[![Licensed under Apache License version 2.0](https://img.shields.io/github/license/kubevirt/kubevirt.svg)](https://www.apache.org/licenses/LICENSE-2.0)
[![Coverage Status](https://img.shields.io/coveralls/kubevirt/kubevirt/main.svg)](https://coveralls.io/github/kubevirt/kubevirt?branch=main)
