docs: change build label from travis to GitHub Actions

Author: mtrezza

README.md

@@ -1,6 +1,6 @@
 # Parse Dashboard <!-- omit in toc -->
 
-[![Build Status](https://img.shields.io/travis/parse-community/parse-dashboard/master.svg?style=flat)](https://travis-ci.org/parse-community/parse-dashboard)
+[![Build Status](https://github.com/parse-community/parse-dashboard/workflows/ci/badge.svg?branch=alpha)](https://github.com/parse-community/parse-dashboard/actions?query=workflow%3Aci+branch%3Aalpha)
 [![Snyk Badge](https://snyk.io/test/github/parse-community/parse-dashboard/badge.svg)](https://snyk.io/test/github/parse-community/parse-dashboard)
 
 [![Node Version](https://img.shields.io/badge/nodejs-12,_14,_16-green.svg?logo=node.js&style=flat)](https://nodejs.org/)