Added all the badges in upgrade (#55)

* Update README.md

* Added all badges

- Go report
- codecov
- Build Status
- Slack

README.md

@@ -1,2 +1,9 @@
 # upgrade
+[![Build Status](https://travis-ci.org/openebs/upgrade.svg?branch=master)](https://travis-ci.org/openebs/upgrade)
+[![Go Report](https://goreportcard.com/badge/github.com/openebs/upgrade)](https://goreportcard.com/report/github.com/openebs/upgrade)
+[![codecov](https://codecov.io/gh/openebs/upgrade/branch/master/graph/badge.svg)](https://codecov.io/gh/openebs/upgrade)
+[![Slack](https://img.shields.io/badge/chat!!!-slack-ff1493.svg?style=flat-square)](https://kubernetes.slack.com/messages/openebs)
+
+
+
 contains components that help with OpenEBS data engine upgrades