Update README to replace the Travis CI badge with a GitHub Actions badge (#1362)

## Fixes Or Enhances

`go-playground/validator` doesn't use TravisCI.


**Make sure that you've checked the boxes below before you submit PR:**
- [ ] Tests exist or have been written that cover this particular
change.

@go-playground/validator-maintainers

Author: nodivbyzero

README.md

@@ -2,7 +2,7 @@ Package validator
 =================
 <img align="right" src="logo.png">[![Join the chat at https://gitter.im/go-playground/validator](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/go-playground/validator?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 ![Project status](https://img.shields.io/badge/version-10.24.0-green.svg)
-[![Build Status](https://travis-ci.org/go-playground/validator.svg?branch=master)](https://travis-ci.org/go-playground/validator)
+[![Build Status](https://github.com/go-playground/validator/actions/workflows/workflow.yml/badge.svg)](https://github.com/go-playground/validator/actions)
 [![Coverage Status](https://coveralls.io/repos/go-playground/validator/badge.svg?branch=master&service=github)](https://coveralls.io/github/go-playground/validator?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/go-playground/validator)](https://goreportcard.com/report/github.com/go-playground/validator)
 [![GoDoc](https://godoc.org/github.com/go-playground/validator?status.svg)](https://pkg.go.dev/github.com/go-playground/validator/v10)