Fix build card (#125)

Author: ilyakaznacheev

README.md

@@ -8,7 +8,7 @@ Minimalistic configuration reader
 [![GoDoc](https://godoc.org/github.com/ilyakaznacheev/cleanenv?status.svg)](https://godoc.org/github.com/ilyakaznacheev/cleanenv)
 [![Go Report Card](https://goreportcard.com/badge/github.com/ilyakaznacheev/cleanenv)](https://goreportcard.com/report/github.com/ilyakaznacheev/cleanenv)
 [![Coverage Status](https://codecov.io/github/ilyakaznacheev/cleanenv/coverage.svg?branch=master)](https://codecov.io/gh/ilyakaznacheev/cleanenv)
-[![Build Status](https://travis-ci.org/ilyakaznacheev/cleanenv.svg?branch=master)](https://travis-ci.org/ilyakaznacheev/cleanenv)
+[![Build Status](https://img.shields.io/github/actions/workflow/status/ilyakaznacheev/cleanenv/test.yml)](https://github.com/ilyakaznacheev/cleanenv/actions)
 [![Release](https://img.shields.io/github/release/ilyakaznacheev/cleanenv.svg)](https://github.com/ilyakaznacheev/cleanenv/releases/)
 [![License](https://img.shields.io/github/license/ilyakaznacheev/cleanenv.svg)](https://github.com/ilyakaznacheev/cleanenv/blob/master/LICENSE)