replace vmware badges w/ travis/codecov

Author: GlenDC

README.md

@@ -1,3 +1,3 @@
-# Validation helpers [![Build Status](https://ci.vmware.run/api/badges/go-openapi/validate/status.svg)](https://ci.vmware.run/go-openapi/validate) [![Coverage](https://coverage.vmware.run/badges/go-openapi/validate/coverage.svg)](https://coverage.vmware.run/go-openapi/validate) [![Slack Status](https://slackin.goswagger.io/badge.svg)](https://slackin.goswagger.io)
+# Validation helpers [![Build Status](https://travis-ci.org/go-openapi/validate.svg?branch=master)](https://travis-ci.org/go-openapi/validate) [![codecov](https://codecov.io/gh/go-openapi/validate/branch/master/graph/badge.svg)](https://codecov.io/gh/go-openapi/validate) [![Slack Status](https://slackin.goswagger.io/badge.svg)](https://slackin.goswagger.io)
 
 [![license](http://img.shields.io/badge/license-Apache%20v2-orange.svg)](https://raw.githubusercontent.com/go-openapi/validate/master/LICENSE) [![GoDoc](https://godoc.org/github.com/go-openapi/validate?status.svg)](http://godoc.org/github.com/go-openapi/validate)